morningbus
Serious Sam is a wicked gahbidge series for chowdaheads.
But still no MMS...
I won't downplay it:
When someone from an unsupported carrier (basically only Verizon now) sends you an MMS not only does the other person not know you didn't get it but you receive no notification that they attempted to send you something. It's a huge flaw, but I think one that can be easily mediated.
Google Voice has been awesome for me in general, I bought one of those Obihai VoIP boxes so I have a "landline" in addition to now being able to make voice calls with data on my cell phone. The only problem I have with it is that I can only get an out-of-state number (they have never offered phone numbers in my area code, the number I have was a local number when I first set it up, before I moved)
I actually just thought up this $10 solution: get a t-mobile pay-as-you-go sim card, activate it (obtaining a new number), and then immediately port it out to google voice.