Hi, I suggest you www.livemeetups.com, free web conferencing tool with Skype conference call and chat integration. No download is requited and you can start presentation with simple log in. The online presentation solution is easy to use for both parties, presenter and attendees. The presenter logs in and gets channel name and password. Then he provides the attendees with the data and presentation is ready to started. Note: It's free and no boring downloads. You'll love it. Enjoy!
Tried it out. Great features. You can also try 321meet, also free, basically for its simple web interface.