Ooh, good topic!
I used to have quite a few soundtracks, but I have a different PC now and I lost lots of music during the switch. But I've got the soundtrack from Street Fighter IV--which is playing in my iTunes library as we speak, LOL--and the Cowbow Bebop TV series soundtrack (I'd kill for the movie soundtrack). I also have the Zone of the Enders: 2nd Runner soundtrack. *sniffle* So beautiful... T_T ^_^
I want the soundtrack from Jet Set Radio Future! It makes me want to put on rollerblades and go spraypainting. I need to get another copy of the Silent Hill 4 soundtrack as well. Akira Yamaoka composes some really good music. Hell, I want the soundtrack to all of the SH games between 1 and 4! I haven't played the newer ones yet, so I can't say whether I want them or not. I wouldn't mind getting my hands on the Street Fighter III: Third Strike soundtrack either. ^_^
Any other good soundtracks? Hmm...
I want the Ghost in the Shell soundtracks. All of them! Both theatrical movie soundtracks, and all the music from Stand Alone Complex. I also want the soundtrack from Wolf's Rain. I love that series and the music is probably the main reason. I envy my friend who lives next door to me because he's got the soundtracks from Ranma 1/2 and Project A-ko, LOL. We go way back (like 14 years), so I'm sure he'll let me get a copy.
There's so many good soundtracks! I can't keep listing them, because I won't shut up about it. I pick and choose a lot of my entertainment based on the music. The Metal Gear Solid franchise is to blame, LOL. Ever since playing Metal Gear Solid back in the days of PSone, I had to make sure that each game/movie/TV series I watch has an even mix of action, drama (or comedy in certain cases) and good music.