I have the baby bug, and have 15 carts. Well, 15 plus my free one, Printing 101, but I haven't decided what to do with it yet, so it's still in the packaging.
The ones I have are the 4 Disney carts (Mickey & Friends, Mickey Font, Happily Ever After, and Dreams Come True), Alphalicious, Fabulous Finds, Doodletype, George, Going Places, Jasmine, My World, Opposites Attract, Paper Dolls, Stamped, and 50 states (which I *had* to have, but haven't used one yet!)
The only one that's out now that I still want is Cursive 101. I'm sure I'll want the new ones that come out. I have no idea what's on it, but I'm sure I'll want the sports carts. Not sure about the Pooh cart, but then again, for a while I didn't think I needed the princess carts, and I've probably used them more often lately than the rest of my carts combined!