I don't know if this has been posted before, but a while ago when I was eagerly awaiting my Tamagotchi's arrival, I went in search for an emulator. I found one that emulates (I think..) the old 1997 Tamagotchis. Here's the link:
http://www.elvenkids.com/newsread.php?newsid=1259It's a PC emulator, and while I've found a few bugs it seems to work perfectly (for some people it seems start a new pet once the computer is turned off, but I didn't have this issue.) You can change the color of your egg, view instructions and choose between 2 games. There's even a useable reset button in the back view. I think it's pretty well done. I would use it more often but I have a Mac and even with Windows installed on it (I refer to this as 'Mindows'

), 99% of the time I'm in the Mac environment.

I've yet to find an emulator for the Mac - probably doesn't exist.
Enjoy! and if this has already been posted... Enjoy
again 