Most attendees arrived in time, but like with any real-life university, some arrived late, and some left during the session. We had an average of 16-17 attendees, and a peak of 19.
Giuseppe presented using a slide set, rather than using the desktop sharing facility that Dimdim offers. Clicking through slides feels real-time, while desktop sharing requires some time for changes to arrive on the receiving end (as we've experienced with the previous session). Also, clicking through slides requires virtually no bandwidth (after the slide set has been uploaded to Dimdim). Giuseppe's voice came over loud and clear. A few attendees reported (in the public chat) problems with sound from time to time. For me, Giuseppe's voice disappeared for a period of 1-2 minutes in the middle of the session, but others I asked didn't have that problem.
Giuseppe also used Dimdim's whiteboard to share some thoughts and URLs. I like the whiteboard feature. It's pretty lean and lightweight. Usability beyond doing simple stuff is another issue, though – but I think that's even the case for physical whiteboards.
This time, recording the session worked flawlessly, except that I forgot to click the recording button when Giuseppe started speaking, so the first few minutes weren't recorded. The recording feature has pretty severe limitations (as described here), but otherwise it's cool: You can see the slides one by one, and listen to the voice, something that I've seen only with client-sided recording so far (for example, Camtasia). Note that the recording has to load fully before you can start viewing & listening. There's also a chat transcript. Both the recording and chat transcript URLs are linked from the MySQL University session page. Try the recording, and let me know what you think of it!