Not sure when the change happened, but Codename Tahiti is now called Microsoft SharedView. Basically this is a free product under the Windows Live line of software tools that lets you conduct online meetings with up to 15 participants for free. While the session loads, there is a Microsoft ad window that does display, but after that everything else is ad free. The interface is unobtrusive and out of the way, and seems to work very well in my tests (in Tahiti phase as well as SharedView phase).
Here is the obligatory sample screenshot:
As you can see the SharedView interface consists of the toolbar at the top of the screen. They’ve also added hooks into vaious Office applications to make it easy to fire up a SharedView session.
To download the SharedView Beta, click here.