Microsoft has made available SharedView, its screen sharing software formerly known as Tahiti, available on its website as a free download. The 3-megabyte program lets you host a live meeting for a maximum of 15 users, sharing your whole screen or a single program with all of them.
The person sharing can give up control to any participant, with each person having their own personalized mouse pointer. Files can be shared during the session, and all participants can download them directly while there. It integrates tightly with Microsoft Word, and could be used to counter the excellent collaboration features at the center of Google Docs. There may be audio and chat support coming in a future release.