Most first (and second?) party titles, and most newer games (since about 2008 I think). I don't know any comprehensive lists, but if you're after popular games, it would be easy to find out if they support 480p through google search.
And also, it may be possible to force some older games into 480p (even though they don't support this through normal means). I've done this with mario party 8 pal and tony hawk downhill jam pal.