These are the games in my PS2 collection that weren't available in PAL format:
- Fatal Fury Battle Archives Vol.1
- Garou: Mark of the Wolves
- Katamari Damacy (more fun than the PAL-released sequel, IMHO)
- The Xenosaga series (only episode II was released in PAL, for some stupid reason)
And I've got the following games in NTSC because they were botched for their PAL release:
- Final Fantasy X International (essentially the same as the PAL version, but without the hurtful squished screen and slowdown)
- Soul Reaver 2 (much of the excellent bonus material was cut to make room for extra languages in the PAL version)
- Tekken Tag Tournament (PAL slowdown is terrible for a fighting game)
- Twisted Metal Black (all of the FMV cutscenes were cut from the PAL version, which completely destroys the mood of the game)
All my other NTSC games were bought simply because they came out way before their respective PAL versions.