I'm really digging the new ChaCha from HTC. And more than that, I'm hoping to see it on T-Mobile USA.
What I don't like is the dedicated Facebook button. I'm hoping someone will find a way to root the Chacha and remove control to the button and allow the user to be able to assign it to another app or task.
It totally looks like the original Android mockup that was flying around the Internet before the G1 was introduced. From the looks of it and the size mentioned on the specs provided, it's about the size of a Blackberry Bold but thinner.