Speak of things not taking off very fast, MMS isn't taking off very fast at the moment.

SMS is just now becoming common in the US. Voicestream has always had it (being one of the few GSM providers), but now other companies have these big ad campaigns to make people aware of the new SMS features on their service.

Having an SMS E-mail addres sis very handy at times, like knowing instantly when the first beta of 2.0 was out :-)