Guys most steam games work like HL2 EP2 works and same with counter-strike source. You should add those games to the 100% work list and if u wanna see a lot of games that work on vista go to youtube.com search maxishine the guys has likea quad core pc and 8800GTX"S runing in sli with a 30" mac screen with vista look at all of his vid's there pretty good he plays many games... check it out you might find some things to add to that list..
Have a link? That will save time browsing through the catagories there. Steam itself generally sees regular updates. The main problems seen here initially was with the sound drivers by Creative not being out. But that's typical when any new Windows versions comes out. XP saw a wait too.