"Whiteboard" style chat program

In the near future, I will have to work remotely with some colleagues. We are considering using a chat program to hold work discussions. The problem is, much of what we do involves a lot of math and drawings, which is difficult to convey quickly through typing or voice.

I have heard of chat programs that have a “whiteboard” feature where each party can hand draw sketches/equations on a blank screen that is seen by everyone simultaneously. Does anyone know if such a program exists that is both free (or very cheap) and multiplatform (across windows, mac and linux)? I have tried searching, but I am mostly turning up non-chat programs (just for use on a local machine) or links to physical whiteboards for sale at office supply stores.

Thank you for your help!

I know MSN Messenger has a whiteboard application through netmeeting, but I’m not sure how widely compatable it is.

You can do this on Yahoo, with their “Doodle” IMVironment. It features a row of crayons, thereby lowering the tone perhaps, but it is a free way to exchange freehand writings on a white surface.

You access it by clicking the IMVironment button at the lower-right -hand corner of a PM window, and selecting See all IMVironments >> Interactive Fun >> Doodle.

You might try http://www.groupboard.com/

They offer free white boards for websites that might fill your needs.

Link-Systems offers whiteboards tailored to math and business applications, but they’re not free.

In my line of work I’ve run across WebEx and Interwise. Both of these firms offer what you’re looking for.
WebEx works on both Windows and Linux. I do not know about MacOS.

I second WebEx. It has a great interactive interface that allows people to raise their hands, utilize a white board, and share applications, powerpoints, etc.

ICQ used to have whiteboards. But I don’t know if they still do.