We have been using and selling Live Meeting for close to a year now. In this time it has only impressed me more and more.
For network support, it is second to none. Who needs to set firewalls? Just send the email invitation, or invite someone into your lobby.
I have been on a couple of support calls with serious client server downtime, and Microsoft support staff have always used Live Meeting.
Even with the most challenging of support calls, I have always managed to get the user to join the meeting in quick time.
Oh, and we've also had some excellent collabortion meetings with clients on projects and training sessions. How can I live without Live Meeting?