My @Home service through Comcast in the Philly suburbs is still working fine; in fact, my up/down speeds are about 10% over normal.
The Excite@Home thread at Slashdot is reporting similar results.
I'm receiving multiple messages that Comcast is still up. I'm glad for you but AT&T is clearly down. I'd use this time wisely and make sure you have a dialup connection. I got lucky and already had one.