Well I'm going to Boston in the fall and I was wondering if there's anything I can do with the seats to make them softer, aside from sitting on a pillow. Whenever I'm driving my HHR my ass gets completely numb after 30 or so minutes and my mom has the same problem when shes in it.

 

You ever try those wooden bead seat covers?

Seriously-I've had them in several old cars with terrible seats-they made a big difference.
(Not sure if you can still get them though...I haven't looked for them in several years.)