SocialText (the wiki company) is returning to open source.
PubSub has announced an open source structured blogging initiative.
Flock, the social browser, is expanding their beta. I went along with Mike and Fred from TechCrunch to check out their office, which is literally in a garage in Palo Alto. Mike has a great photo of one of the developers asleep there!
Very Start-Up 2.0 and I feel privileged to have seen that :-)
A whole lot more is happening, including a bunch of new Web 2.0 services debuted at the conference. TechCrunch and ZDNet both have extensive coverage. The ones getting most buzz in the hallways of the conference are Zimbra and Orb.