I too enjoyed the webinar, although I think an early log in did help a bit, as I did have to download something first!
Even though our broadband download speed here is only about 1 Mb/s the video displayed fine, and the sound was clear, although as others have already mentioned I did 'lose' it a bit for a minute or so towards the end… but it came back again by itself.
It was actually my first 'webinar' experience, and I have to say I was very impressed, and would like to say 'well done' to all involved in its organisation, particularly Eben, who apparently was still in Cardiff at the time, rather than in Cambridge, as had been originally planned.
I had hoped that we might even see a 'guest appearance' from Liz (who I assume was also around?) but unfortunately this didn't happen!
Just for the record I was running Google Chrome under Windows 7.