After browing the twitter site, I stumbled on Skitch. On the surface, it looks like Skitch might be a good tool to help our remote teams share UI mockups and quickly play with some different product design ideas.
Typcially, we use gotomeeting, share our screens, and then I use snagit to capture images. After an image capture, I jump into ms paint and start doing some design updates.
It might also be a nice plugin addition to our TeamSessions - Sametime persistent chat rooms.