Not enough to really matter.
A Dealer posted the list below on another forum. Sounds right to me. I also thought there was some change in the rear seat - the way it flips forward. And they moved the seatbelts, but that might have been in 07.
There are also lots of really tiny changes all the time. For example, they redid the bumper in id year 2009. No one noticed, but it made our tire carrier not work right.
Hill Start Assist- Standard on all models
Trailer Sway Control is now included with the trailer Tow Group
Power group now standard on Sahara
Most of the other changes are pretty minor:
Larger sun visor
New center dome lamp with switchable directional lighting
Drop in bin added to center console
Storage nets on center stack and side of center console
Rear tow hook is now compatible with the receiver
Subwoofer no longer an option on the X model
No more option for Rear Locker/Sway Bar disco on 2TC X model