I've uploaded a video of my Web 2.0 Expo Berlin talk below. Unfortunately there was no audio available, so I've had to record myself speaking in the hotel - doesn't seem quite the same without an audience.
I had a small but really pleasant crowd turn up - not surprising since I was up against some superstars from Google.
There is a lot of buzz about open social, I should check it out myself in more detail. I do hope it is as really open as it sounds.