I didn't know how to email you, so I hope you don't mind me using this forum to contact you.
We are in the process of establishing tutoreasy (www.tutoreasy.com) as a place where anyone can teach or learn any subject - live and online, using great technology that allows you to Speak to each other, See each other, and share/create/change the same documents live and online.
I was wondering if you'd be interested in using our technology to do regular interactive Maths broadcasts/lectures/seminars. The technology is so flexible, and it offers a leading edge way to provide real interactive services.
Hope this is not too much of a sales pitch, as it could really let you do something powerful in the maths world.