I decided to search for some new drivers today for the 8600GT for the MBPs. Here are the best working and newest ones I found.
NOTE: Make sure you download the modified INF file along with the driver and copy the modified INF file into the directory you extract the driver into BEFORE trying to install, otherwise it won't work.
(XP 32bit) http://www.laptopvideo2go.com/forum/index.php?showtopic=18823
(XP 64bit) http://www.laptopvideo2go.com/forum/index.php?showtopic=18826
(Vista 64bit) http://www.laptopvideo2go.com/forum/index.php?showtopic=18825
(Vista 32bit) http://www.laptopvideo2go.com/forum/index.php?showtopic=18824
NOTE: Make sure you download the modified INF file along with the driver and copy the modified INF file into the directory you extract the driver into BEFORE trying to install, otherwise it won't work.
(XP 32bit) http://www.laptopvideo2go.com/forum/index.php?showtopic=18823
(XP 64bit) http://www.laptopvideo2go.com/forum/index.php?showtopic=18826
(Vista 64bit) http://www.laptopvideo2go.com/forum/index.php?showtopic=18825
(Vista 32bit) http://www.laptopvideo2go.com/forum/index.php?showtopic=18824