One more to add for consideration: sharetheboard.com I prefer to write on a real whiteboard. I like the freedom it provides and the natural, physical feedback.

One more to add for consideration: sharetheboard.com I prefer to write on a real whiteboard. I like the freedom it provides and the natural, physical feedback. Share the board allows me to use a real board, digitize contents in real time and make them legible to remote colleagues. Still in beta but already useful.