I'm guessing people's Twitter habits and social graph have solidified enough where Buzz isn't a real threat, but we'll see what happens. My guess is that this lives somewhere between Twitter and Movable Type's Motion.
The funny thing is that I could have Buzz'd this, but I blogged it instead. I'll now share the link to this on both services and create more ancillary inside-baseball noise. I'm wondering when the madness will end.