Link of the day: Coccinella

My friend uses Coccinella to collaborate long-distance on theory projects. He showed it to me on his Mac. The program acts like a digital whiteboard. If you buy a pen tablet, you can write equations and draw figures on an "electronic" whiteboard that your friend can see on his/her side of the internet. Combined with talking over phone/internet, it's almost as good as an in-person meeting.