Yep. I started a communal blog (everyone has author access) a few campaigns back, and we've used it ever since. Beats the hell out of playing phone/IM tag trying to find out when people are available to play.
It's not used for too much more than that, really, but that's not a problem. The occasional campaign intro or bit of ooc chat tends to slip in, but we have a seperate IRC channel for that when playing, so we tend to do that during the game.
All in all, having some sort of group website/forum/blog is disgustingly useful, even if just for keeping track of availability.