The Weather Underground.
The latest Daily Downpour audiocast, which is billed as the "final" Hurricane Irene special, from Fri. August 26th at 4:30 PM.
The attached map is of relative storm surge probabilities (h/t Jeff Masters at WU again). Lots of H2o for the Mid-Atlantic coast and waterways.
Fox News Extreme Weather Center.
WRAL Raleigh Durham Fayetteville liveblog-style coverage.
*-UPDATE: Philly.com staff report about Sunday's situation.