I don't have exact numbers of anything, but if I had to render a guess:
About 450-500 CDs
About 40 DVDs
I have several hundred albums downloaded/ripped/burned/etc that I don't own, but I have no shame. It's mostly a tool for checking out new music, but I spend pretty much everything I can on buying music I love - so I'm not going to feel guilty for having a much bigger interest in music than I can afford.