I've collected a fair few anime soundtracks, mostly of shows I've seen and enjoyed (Love Hina, most of the Studio Ghibli movies, AIR, Kanon, Kare Kano, Azumanga Daioh, Rurouni Kenshin, FLCL, etc.) If I liked a show a lot, I'll do my best to get the original CDs, but I got a lot from torrents as well. I also enjoy doujin music that reinterprets game/anime soundtracks, and have downloaded a fair few from the melonbooks.com music section (they seem to accept foreign credit cards).