The only WiiWare game I currently own is Dr. Mario Rx. It's really fun if you are a fan of Dr. Mario. The best part is definitely the multiplayer. If you've ever played Tetris DS, it's similar to that. I would recommend it to anyone who likes challenging puzzle games or anyone that likes fast-paced online play.
This thread has convinced me to buy Toki Tori.
Add me on Xbox Live: TopCat8