Jeez, I collect a lot of stuff. Regular pack rat right here. XD At any one point, I've collected:
Coins -- Both U.S. and foreign coins. My dad was in the Navy and often visited other countries, so he definitely "enriched" my collection, lol.
Movie stubs -- This was kind of short-lived. My older sister started it and I thought it was cool, but I just forgot eventually. *shrugs* I think I still have my Napolean Dynamite stub somewhere, though, hehe.
Beanie Babies -- The ones from McDonalds, so I guess they weren't the real ones, but at least they were much cheaper to get. I remember, I used to go so often the employees started recognizing me, which isn't easy to do in a bustling place like Miami, lol.
Bottle Caps -- Collected them with my little sister. Every trip to Barnes and Noble meant at least another two to add to our collection. Unfortunately my mom had no idea, so when she came across a messy looking pile of caps... it was a sad day. XD
Pokemon Cards -- This one goes without saying, heh.
The only one I continue to collect today, though, are game cases. I have the game case of every game I've ever bought, starting from Pokemon Blue back in 1998... long after I lost the game itself. XD