On the '06 year models, there are some wiring harness changes, new mirrors, and floorpan.
These are the only changes that I know of for sure. The only enhancement would be the mirror's functionality, as I am not sure the floorpan and wiring harness changes add any benefit.
I am not sure of the year model when they dropped the key on the passenger side front door. This is not really a benefit, but a cost savings, unless the thieves can no longer break in on that side 
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H2 SUT 4.56 Gears, Front Locker, Cognito Pitman/Idler kit & Idler Pivot Kit, Fab Tech Tie Rods, True Tech Trailing Arms, Edelbrock Panhard Rod, PML rear Diff & Tranny Pans, Corsa Exhaust, Dynatech LT Headers, Diablo Predator Programmer, Volant CAI, Warn 9500 Winch, Escort 8500x50 & ZR3 Laser Shifter, Delta Light Bar, Rancho Steering Stabilizer & Bilstein Shocks, Ron Davis Radiator, PowerSlot Rotors, Hawk Brake Pads
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