Winamp sez 89.31 GB (11305 files), but it's wrong. So, +2 DVD's of mp3s, about 20 CDs I haven't mp3d, and maybe 75 records (I'm still figuring that one out, I've got a line from the record player to my audio card but it only comes through really quiet...). I'd guess an even 120GB, if it were all mp3.
Current formats:
75 Records (singles)
120 CDs
11400 mp3s (this includes CDs I've ripped)
12 oggs
5 flacs
1 Teebee live mix .wmv