I tried out a multitouch keyboard on Android with the recent phone. Intriguing idea, for sure, but there was something inherently awkward about it. It feels like you are just mashing around on the keys.

Also, either from my own inexperience, or poor prediction/detection, it didn't work particularly well. I ended up going with Swype, which focuses on one-finger no-lift typing with a heavy emphasis on pattern recognition, prediction, and learning from your/its mistakes. So far, it's been useful when I needed it, and gotten out of my way otherwise.