The question is as titled.
I have (currently) 52 CDs, 60 LPs, and 53 7" singles. I have about ten cassettes lying about, but I can't be arsed to really count them.
I know my collection is incredibly small (Fixxy or Byron can blow me out of the water, but what the hey), but I treasure it well enough. I only buy what I really like, so I am selective.
Additionally, if you have any treasures in your collection that you are particularly proud of, mention them. My 'treasures' include a mint DSOTM on vinyl (the imfamous 'different mix'...

) and a Doors compilation LP that I have in both stereo and quad (the stereo one is a lot more rarer than the quad one, actually).