I just wanted to add that Baldur's Gate runs fine on my Ubuntu Linux 10.04 box, through wine. No issues at all, up to now,

I can play it fullscreen, sound works, mouse works, everything seems great.

Here you go: http://www.gog.com/en/forum/general/gog_games_that_are_working_fine_with_linux_wine/

Thanks, I'll check it!