Does anyone know any online games/learning activities?

[MRMO]

I'm helping run an online adult learning course, and I would like any ideas on online learning activities. Anything is helpful, like icebreaker activities that would work online, like an example is Jeopardy on a powerpoint. They will be looking at a powerpoint and will be able to talk through skype, and draw on the screen with a whiteboard program, so things that involve drawing would work as well. Any input is appreciated.