Yup! I didn't renew my AT&T contract in favor of Google Voice. Whenever I find an ~iTouch/Android (Zii EGG!) portable that does what I want over WiFi I'll happily avoid larcenous SMS fees.
I'd say that's a good threat to AT&T.
I'd say that's a good threat to AT&T.
It's all but replaced my home laptop for gmail/twitter.