Virtual Puppy.com! Here you can adopt your own virtual   
puppy for free!

 Vitual Kitty.com! From the same makers as virtual puppy, 
also free.

 Neopets.com! Cool site where you can create your own pet!
Has games & is totally free!
 Petz.com! One of the best we have seen   
so far! Not free, but worth every penny! <--Bonus Smile!

 Greetsomeone.com! Virtual cards to send for every       
event.