Felt’s 2010 mountain bike line is led by the 130mm-travel Virtue full suspension line, featuring their patented Equilink rear triangle.  Introduced in their 2008 line, the Equilink is the red beam in the linkage connects the the lower and upper rocker arms behind the seat tube.  Depending on the location of the pivot point on each rocker arm, Felt can manipulate the effect of loads on the suspension and tune each bike to its intended use.
The Equilink is used across all of Felt’s full suspension models, which also includes the All-Mountain oriented Compulsion series. You can watch a video about the Equilink here at the bottom of this post.
The 2010 Virtue 1, above, is the top-end XC full suspension bike.  It’s equipped with an XT drivetrain and hydraulic disc brakes with 180 / 160mm rotors front/rear, Fox Float RP23 shock and 32 RLC 120mm fork, integrated Cane Creek headset and XT wheels with Felt Devox TAR tires.  The front triangle is 7005 aluminum with a hydroformed top tube and full carbon rear triangle.  The package is rounded out with Felt stem, bar, seatpost and saddle.  MSRP is $4,299 and it comes in four sizes ranging from 15.5″ to 21.5″ in 2″ increments (S, M, L and XL).  It drops $100 from 2009’s model, and it may drop a tiny bit of weight with the switch from a Rockshox Revelation fork to the Fox model…claimed weight of the ’09 bike was 26.0lbs.
Hit more to see the rest of the line, including the 29er “Nine” series…
The Virtue 2 and 3 (left to right) drop the spec down a bit.  The “2” shares the alloy/carbon mixed frame with the “1”, while the Virtue 3 gets an alloy rear triangle.
The Virtue 2 has a Shimano crankset with SRAM X.7 shifters and front derailleur, X.9 rear derailleur, Avid  Elixir R brakes with 185/160mm rotors, Rockshox Monarch 2.1 shock and Recon SL Solo Air fork.  Felt bits complete the cockpit, and it rolls on Mavic XM-317 rims laced to Shimano M525 hubs with Felt Devox TAR tires.  MSRP is $2,499.
The Virtue 3 has a Rockshox Ario 2.1 shock with a Tora SL Solo Air fork, Shimano Deore crankset, shifters and derailleurs, M486 brakes and Felt cockpit parts. It rolls on WTB rims laced to Shimano hubs. MSRP is $1,799.
Felt’s Compulsion line is their 150mm-travel All Mountain range of bikes with 7005 aluminum frames w/ hydroformed top tube and alloy rear triangle and ISCG mounts.  The Compulsion One, above, tops the line with Truvativ Stylo Octo 3.3 crankset, SRAM X.9 shifters and front derailleur and X.0 rear der.  Bounces are handled with the 2010 Rockshox Revelation Team 20mm thru axle fork and Monarch 4.2 rear shock.  Avid Elixir R brakes stop the Fulcrum Red Metal 1 HH wheels. Felt grips, post, stem and bar round out the package.  MSRP is $4,299 and it’s available in the same sizes as the Virtue line.  (Interestingly, Felt switched to Rockshox for the “1” from a Fox TALAS fork in the 2009 model)
The Compulsion 2 (left) comes in at $2,999 with WTB rims, Shimano SLX hubs, Fox Float RP2 shock and 32 Float RL fork and full SLX brakes and drivetrain.  Felt cockpit parts all around.
The Compulsion 3 brings another fork brand to the group with a Marzocchi XC 44 RLO, Rockshox Ario 2.1 shock, full Shimano Deore drivetrain, WTB Speed Disc rims and Felt bits.  MSRP is $1,899.
Felt’s Nine range satisfies your 29er fix with four geared models and a single-speed specific version.  The Nine Team, above, is a full carbon Ultra High Modulus (UHM) frame decked out with Truvativ Noir cranks, SRAM X.0 shifters and rear derailleur (X.9 front der.), Rockshox Reba Team Dual Air 80mm 29er fork and Avid Elixir CR disc brakes with 160mm rotors front and rear.  It has a Control Tech carbon seatpost with a Felt seat, carbon handlebar and alloy stem. It rolls on Mavic Crossmax 29er wheels with WTB Vulpine tires.
Differences from 2009 model are the move to Elixir CR from Juicy brakes, WTB tires from Kenda Small Blocks and the paint scheme.  Price remains at $4,999.  2009 bike weighed (claimed) 21.4lbs, so expect maybe a slight drop thanks to the lighter brakeset.
The Race (above, left) is a double-butted 6061 aluminum frame with hydroformed top tube and comes in at $2,499 sporting a full XT kit, Reba Race dual air fork and WTB Lazer Disc rims w/ Vulpine tires on XT hubs.  It, along with the lower-end Comp model ($1,199, not shown…oddly, it has the only 100mm travel fork of the Nine group, a Manitou Drake w/ Hayes brakes) and the Solo (below), comes in four frame sizes: 15.5, 17.5, 19.5 and 21.5″
The Nine Elite (above, right) has a slightly less fancy High Modulus (HM) carbon frame.  Both the Team and Elite have Felt’s “Dingle Guard,” a replaceable kevlar downtube protector that mounts just above the bottom bracket to protect against trail scree thrown up by your front tire, and a Kevlar chain watcher to keep the chain from grinding into the carbon frame if it drops off the granny.  They’re available in three sizes: 16.5, 18.5 and 20.5 inches.
The Elite comes spec’d with a full Shimano SLX group, including their centerlock hubs and rotors, with WTB Speed Disc rims and Felt cockpit parts.  It has a Rockshox Reba SL dual air 80mm fork and retails for $2,999.
The Nine Solo has double-butted 6061 alloy tubing with Felt’s CNC machined eccentric bottom bracket shell.  It gets a Truvativ Stylo 1.1 crankset with a Felt 19t cog, a Rockshox Reba SL dual air 80mm fork and Hayes Stroker Trail brakes with 180/160mm rotors (front/rear).  WTB Laser Disc rims mate to Felt SS hubs, and Felt cockpit parts complete the package.  MSRP is $1,499.  (2009 model weighed in at a claimed 23.9lbs w/ essentially the same spec, the only thing that’s changed is a switch from Kenda to WTB tires.)
For those holdouts out there, Felt’s Six lineup is their XC racing series designed with pretty much only winning in mind.  Three models are available, the LTD (above), and the Team and Elite (below), each with a different grade of carbon.  The LTD gets Felt’s top-of-the-line UHC (Ultra Hybrid Composite) carbon monocoque construction, which uses carbon nano-tubes in the resin to add both strength and elasticity to the frame.  By elasticity, it simply means the frame is better able to take the stresses and pings from debris, making the frame more durable without adding weight.
All three models use Felt’s Dingle Guard and kevlar chain watcher, and they all use an 1-1/8″ integrated headset.
For 2010, the LTD is being offered as a complete bike (only framesets were available for 2009), and it’s decked out with full XTR, including the chain and cassette, a Rockshox SID World Cup 100mm fork, Felt Devox tires on an XTR wheelset, carbon Control Tech seatpost and Felt bits throughout the rest of the cockpit.  MSRP is $6,999 and it’s available in 15.5, 17.5, 19.5 and 21.5″ sizes.
The Team model uses Felt’s UHM carbon monocoque frame spec’d with Truvativ Noir carbon cranks, SRAM X.0 shifters and rear derailleur (X.9 front), Rockshox SID Race 100mm fork, Avid Elixir CR brakes, Control Tech carbon seatpost, Felt cockpit and Fulcrum Red Metal One wheels on Felt Devox tires.  MSRP is $4,999, and it (and the Elite below) are available in the same sizes as the LTD.
The Six Elite gets a full Shimano SLX group, Rockshox Reba SL 100mm fork, Mavic rims on SLX hubs and a full Felt cockpit.  It’ll set you back $2,999.
Felt’s “Q” line of alloy hardtails offers price points for those just looking for a performance mountain bike at entry level prices.  They have 6061 aluminum frames with hydroformed top and downtubes (the 720 also has hydroformed seatstays).
The Q720, above, has Shimano Deore bits with an SLX rear derailleur, Rockshox Dart 2 100mm travel fork  and WTB/Shimano wheels for $999.  It comes in five sizes from 13.5″ to 21.5″ in 2-inch increments.
The Q620 ($699) and Q520 ($469) drop down to Suntour shocks and drivetrain bits, Tektro brakes and a mix of Shimano and Felt hubs with WTB rims.
For the up-and-comers, Felt’s Q24 kids mountain bike has a 6061 aluminum frame with a 50mm travel fork, Shimano Revo shifters and Altus rear derailleur, aluminum cranks, post, stem and bar with Tektro kid’s levers and V-brakes.  It rolls on 24″ wheels and will cut your Christmas / Birthday budget by $329.
FELT EQUILINK VIDEO: