People complaining about outages at Twitter often say (as Scoble does today) that people will switch to some other service. Scoble says Friendfeed, others say Pownce.

This confuses the hell out of me. Those services do not have an SMS interface. The SMS interface is what makes Twitter interesting and useful. I don't understand how Pownce can even claim to be competing when they haven't solved the core problem that Twitter solves, which is being a no-brainer SMS broadcast/aggregation service.