I'm new here and I just came across this topic so thought I would give a list of the games I would like to see native on Linux unfortunately most of these games were purchased through Steam but hopefully Steam will be on Linux soon.
UT3 (I know, probably will never happen)
Sid Meier Railroads
World of Warcraft (I know, Blizzard apparently already has a Linux version but refuses to release it.)
Return to Castle Wolfenstien (Purchased from store.)