I downloaded Zooloretto....but alas, we had to do some shopping, so I have yet to play it either.
I DID get to play one called Plants vs. Zombies...What an awesome game! It has a "tower defense" type flavor to it, but the humor is excellent. And it's VERY, VERY addictive!
Thanks for all the suggestions....keep 'em coming.
Addictive? Take this as either a recommendation or warning: Angry Birds. It has the "Just one more try" aspect that piles into an hour... or two. I swore off it, although it sits there... mocking me.