I've got a meeting coming up which will take place over Skype. I'm running Mac OS and they're running windows. I have a Keynote presentation which I wish to walk the person through, iChat's presentation sharing feature would be ideal but that's obviously not possible due to them having Windows. What would be the best way to share my presentation (even if it's just sharing the screen) - preferably for free but if I have to pay for something decent then that's fine. Update: I've just signed up for a free trial of BeamYourScreen but please suggest anything else you may know of.