I didn't see any mention of this on the VoIP blogs I read, but it seems to be worth noting.
FreeSWITCH version 1.0.0 was released on May 26 after about three years of development. I would call it a cross between Asterisk and OpenSER. It's robust like OpenSER but has more base features similar to what Asterisk provides. Makes sense, as the developer is a former Asterisk developer.
Interesting blog post: How does FreeSWITCH compare to Asterisk?
It's designed as a soft-switch, not a PBX (see FAQ) but you can add the PBX features on to it that you want. I think this will be a real competitor to Asterisk, sipX and whoever else in the free/open-source world.
Junction Networks offers some cool services including hosted conference bridges, which they're powering with FreeSWITCH.

Bill, i have a question that's been burning inside for a while -- why do we implement separate networks for voice and data? Why not just use 802.1p/q and DiffServ?
I've been through three VoIP implementations, 2 with Cisco Phones & Call Manager and 1 with 3COM NBX's. I've always kept the phones and data on the same network with no insurmountable problems.
thanks!