Details of how to replay the UG meeting from last Wednesday were posted on Andrew Coate's blog here:
I have also copied them here:
Enter your name
On the next page, please enter your Email and Company Name (if required) and click Submit.
Choose between the pure Windows Media format (audio only) and the Microsoft Office Live Meeting Replay (which allows you to actually see what was on the screen as well as move forward and back in the presentation based on the slides)