I wish I could be in Hamburg right now, but unfortunately I have a tough milestone ending tomorrow. So, I even can not watch the web casts — but of course I will do this on the weekend (if they are available on Google Video).
I am begrudging my boss for having this great opportunity to see the sessions, take part in the workshops and to make contacts... I really have to ask him out tomorrow. ;-)
Hopefully there will be another Developer Day next year in Germany...

Update:
Vladislav Malicevic at Google Developer Days 2007
I found the lucky guy!