I feel so stupid now, I had like 2 or 3 (including a Tamagotchi Angel), and I think I threw them all away when I cleaned my room a few months ago.
I used to collect all sorts of Virtual Pets, I had a Jurassic Park Giga Pet, some dumb little bear thing I got from some kid for my 10th b-day, some stupid kitty one that died all the time, a Salem the Cat (from Sabrina the Teenage Witch) Giga Pet (still have that one), and a Giga Face. Those were dumb.
I think I had one of those Nano Babies too, but I can't remember. Oh, and I had a Digimon (which was kinda like a Tamagotchi, in fact they seemed really similar, and you could hook 'em together and battle).