A general query...

Does anyone know of a good online conference/meeting tool? Qualifications are:

• voice out for presenter
• text chat in for other participants
• slide/presentation support
• screen sharing
• doesn't require a big client
• doesn't require a dial-in conference call
• cross-platform
• low-ish bandwidth
• free


I know about Second Life, but I believe it violates the "doesn't require a big client" and "low-ish bandwidth" requirements. I'm looking for something that is easy for attendees of the meeting to use, preferably without needing to install software on their machine.

Any MySpace mavens out there?

Not in simple social networking and tech terms, but actually using MySpace to promote a performer?