Mashes up various web services (Google Maps, Flickr, plus others) to give you a map-based view of who's coming to your event and to facilitate setting up meetings while there.
Jan Staller is the photographer behind Frontier New York, a slightly surreal look at New York City from angles that show no human beings. Great photos.
From PhotoJoJo. This has been floating around a while, but I don't think I've got it in my links. So ... voilĂ . Print short videos from your phone or camera to a tiny flipbook. Cute.
Sign up for an account, get a snippet of code, and embed a Flash-based widget in any site which will allow visitors to contact you directly via audio (video is coming).
Dandelife is "Social Biographies 2.0" -- kind of a blogging platform for your memories. Abbot is the founder. Looks very cool, though I haven't tried it yet.
A presentation from the very smart, and local-to-me, Inkblurt on communities of practice and their meaning for web 2.0 stuff that I don't understand. Another thing to read someday.