I came across this link to a game new game called Ekoloko and spent some time playing around in it.  There are some really cool things about it, but I have to warn you, you'll need a little patience as you figure out how to move around in the world and play the games. Accounts are free, but you'll need to get your parents' permission first.

Ekoloko is a new virtual world where kids can chat & play games with friends AND take care of the environment! The world is gorgeously colored, the graphics relaly stand out.  And a neat feature for all your bi-lingual types out there, it is available in Hebrew and English!  If you like playing Club Penguin, but are ready for a greater challenge, give Ekoloko a try!