Smozzy : Browse The Web Without A Data Plan On Android Phones http://snapvoip.blogspot.com/
Once in a while an app comes along and you say "Hah" and Smozzy does that. Even though limited to T-Mobile network, the app which is in beta, allows one to browse the web without a data plan.
Smozzy does that by using you unlimited messaging plan via SMS and MMS, just like your Android browser does with a data plan.(Due to the large number of messages sent and received, it is recommended that those without an unlimited messaging plan not try this app)
So if you are on T-Mobile and have an unlimited data plan on either Nexus S or HTC G2 phones, head over to the Android Appstore, Android Market. If you want to join the discussion about the app, hacker news is the place.