Star Trek Elite Force 1 & 2. :-)
Also Sonic Generations.
I'd love to see the old Mechwarrior games on GOG, but I heard 3's source code was lost.
From what I read in the interviews alot of games on GOG lost their source. GOG actually had to go order the games off Amazon or ebay after getting the rights.
I read that on some other website as well. Also apparently the rights for Mechwarrior 1 & 2 aren't owned by Activision now...who owns them?
I'd love to play the first two but especially 3, because 3 is supposedly the best in the series and despite 4 being free I keep hearing it's not the best Mechwarrior.