http://www.thesync.org/
A coworking, collaborative space in Bangkok, near the MRT!
http://www.bigbluebutton.org/
Just glanced quickly, sounds very interesting. Combines over 14 projects to create an open source, cross platform web conferencing platform. Cool.
http://rypple.com/
Online coaching, feedback, performance reviews, that kind of jazz, for teams or businesses based around facebook or something of that nature.
http://www.boilerjuice.com/
Interesting shopping comparison vertical focused entirely on heating oil. Includes smart examples of cross / up sells. Hat tip Dafydd.
http://www.tungle.me/
Neat calendar service. Sync with desktop clients, mobiles, etc and then displays public availability and allows people to schedule events while handling timezones smoothly. Hat tip Anthony Feint.
http://the-hub.net/
The hub is a cross between a members club, an incubator, a serviced office, and a few other collaboration methods. Hat tip guaka.
http://coworking.pbwiki.com/CoworkingBrooklynTreehouse
Another coworking space in Brooklyn for $250/month, about 40 minutes by public transport from Greenpoint.
http://coworking.pbwiki.com/Coworking-Brooklyn
Coworking space in Brooklyn for $200/month about 30 minutes walk from Greenpoint.
http://www.3rdward.com/
Shared artist facility including photography studio, wood shops, office space, etc. Temporary 3 month memberships are $180 or monthly basic is $39 a month.
http://projectpier.org/
ProjectPier is a Free, Open-Source, self-hosted PHP application for managing tasks, projects and teams through an intuitive web interface. An opensource version of basecamp! Looks pretty basic, not nearly as ajaxy / designed as 37 signals.
http://collabtive.o-dyn.de/?lang=en
Collabtive is an open source clone of BaseCamp (the 37 signals project management software) built in PHP backed by MySQL.
http://workatjelly.com/
Jelly is a bi-weekly working meeting where people get together to work in someone's house. It's a co-working type thing for people who can work remotely.