I was pretty impressed by the Google Adsense event. There were around 90 publishers from 26 different countries. I was probably one of the smallest publishers there, so I felt I was pretty lucky to be there. The event was on the 13th floor of the new Google Montevetro building, so the views were pretty impressive too.
I posted a blog on the event, focusing on the Adsense optimisation side of things
Adsense Optimisation Google Adsense Event # 1 « Andrew Harkness. Some of the tips I was pretty familiar already, but some tips were completely new... for example the ad unit that come top in your code will be the one that receives the best CPC (top tip!!).