BBM-like iPhone app? I keep hearing all this hoopla about BBM (Blackberry Messenger) and I want in on the fun. Is there anything similar to BBM out there for the iPhone? I heard WhatsApp was something like it, but just wondering if there were any others.
WhatsApp and PingChat are the major games in town.  I've also heard a bit about Cnectd

Nothing has really sold me yet, as I'm looking for proper delivery and read notification a la BBM.

Now if someone could figure out how to cross the impossible chasm to somehow connect into the BBM network, it would be a game changer.