I would love to see the Fongo App support true MMS send/receive, to/from real cell phones.
Right now messages sent with media from Fongo include a link to the embedded content, which I guess isn't too bad, but when senders attach media content (and text), the Fongo app, on the receiving end, is completely oblivious that anything was event sent! Just imagine the frustration: "Hey, did you see that picture I texted you?" "Huh, what picture? You didn't text me anything!"
A couple competing/similar Apps I tested do support true MMS to/from cell phones, so I'd love to see Fongo get to that level, and then it would be worthy to port my second cell phone number over to Fongo so I can use a single device...