I gave Citrix GoToMeeting a quick try this morning and it works rather good. Simply it is a shared presentation tool where the whole desktop is shared to all receivers. No audio, no video.
The user interface was really nice. Nice colours. Nice buttons for inviting users and sharing control. The shared desktop was scaled nicely on the receiving side. I got a 86% scaling and it looked very good. The update could have been a bit snappier though.
The client was installed via Java and I installed it and hosted a quick meeting within 3 minutes.
Regarding control, one or several other users could control the shared desktop. As far as I could tell only one desktop could be shared at one time though.
Seems to be a Windows only solution. MacOSX just gave an error “Your Operating System Is Not Supported”.
A simple shared deskstop/presentation tool that really seems to do the job.