What Else Do You Collect?

This fun little Smart Set article about business cards reminded me that I collected business cards for a year or two when I was a kid. I also collected rocks, stamps, stickers, super balls, and inkwells at one time or another. Werner Muensterberger might call me compulsive, and I am certainly a 'collector.' Today I'm posing a question to our readers: what do you collect (aside from books or manuscripts)?