Silent Hill Shattered Memories has a PSP/PS2 version, also Wii, but believe the Wii was the main developing platform so that doesn't count really.
Harvest Moon Innocent Life got ported to PS2 also.
Don't know if I'm the only one but I much prefer picking up the PS2 versions, would rather play with real controller on my TV+upscaled resolution through PS3 BC.
Yeah, mid 2009 release, which is probably why it only came out in Europe, between that and that the series is more popular there (Wipeout HD Fury on the PS3 actually had a boxed release in Europe, in the US it's DD only...). It's really too bad, I really wish Wipeout Pulse had had a US PS2 release too... I'd have gotten it for sure!
Harvey Birdman was ported to the PS2 and Wii. They were all released at the same time, but it was originally only a PSP title and ported to the other two.
Actually, by that logic I guess PuzzleQuest would count. Originally released on PSP and DS (albeit there was a PC version in the works as well), then ported to everything in existence, including the PS2 and XBLA.