Autoblog has a fair bit of technical and summary information for the G8.

http://www.autoblog.com/2007/02/07/chicago-auto-show-gm-rwd-fans-can-rejoice-for-the-pontiac-g8-h/

and this site has some good interior pics :

http://blogs.cars.com/kickingtires/2007/02/g8_interior.html