I've been involved in a couple of concerted efforts to get members of the Christian Left across America to talk to each other. After endless phone conferences and emailing between leaders, several conferences are emerging, along with great plans for websites.
The two I've worked most closely with are linked to abundantly from my sidebar:
But the rank-and file know what they need, and they're not waiting for someone to make it for them.
Check out the LiveJournal Christian Left chat board.