I have used audiovideoweb.com in the past to produce live webcasts of Powerpoint combined with live video of the speaker. As far as the price goes, and for 75 attendees, I haven't seen anything that can compete on price. It uses the windows media format and has worked reliably, no complaints there. The only complaint the client has is that the screen size of the PowerPoint is a fixed size and a bit on the small size. However, they do not have a budget to go much over $500.00 per webcast. I have not seen any other no contract, ad-free, budget offerings. Are there any out there?