07 comes with a new computer reflash, the seats feel more comfortable (better cushioning in the back), the leather seems softer, and to me, it rides quieter.
I have an 06, but a buddy of mine from work has an 07 and these are the things I noticed. Most of them are subjective, and also possibly just due to manufacturing differences/anomolies rather than "design changes"
I would like to know if there are any engine component differences between the two years, because it seems to be the 06's that are blowing up.
Feel free to chime in anyone else.