Two quick items:
A new podcast, Flash-back, plans to review The Flash on a monthly basis. So far they’ve posted an introduction to their podcast and an overview of Flash history. (thanks to Heatwave the Rogue on Comic Bloc)
The forum Speedster Site also launched a few days ago, and is focused exclusively on the Flash (thanks to younglionsimba)
Update: In the Comic Bloc thread on “Flash-back,” Chris Hansbrough pointed to another podcast, Tom vs. the Flash, a series of 5–10-minute reviews of classic Silver Age Flash episodes.