Well, since it seems to be okay to post non-pony things here, I figured I'd give it a shot! My primary collection is all manner of those little keychain virtual pets - not just tamagotchi, but all the other ones that followed suit - giga pets, nano pets, and alll the other little off-brand ones hitching a ride on the craze. Original Tamagotchi, Modern Tamagotchi Connections, that weird one that let you raise a chicken you got because the toy store was sold out of tamagotchi when you were little. All of em!
I'm not overly concerned about condition, as long as they work.