Thinkature

Posted from Thinkature website:
"Thinkature brings the richness of in-person, visual communication to the web by placing instant messaging inside a visual workspace. Use it as a collaboration environment, a meeting room, a personal web-based whiteboard, or something entirely new.

Shared workspaces in seconds
With Thinkature, you can create a collaborative workspace and invite coworkers, friends, and colleagues to join you in just seconds. Once inside your workspace, you can communicate by chatting, drawing, creating cards, and adding content from around the Internet. It's all synchronous, too - no need to hit reload or get an editing lock."