Following the Lotusphere Speaker Rating meme...
For our Java Jumpstart session, the numbers (approximately, depending on how you count surveys that answered some questions and left others blank) are...
Quality of material: 85% Excellent, 15 % Good
Quality of speakers: 91% Excellent, 9% Good
Update recommended: 97% Yes, 3% No
Speakers recommended 100% Yes, 0% No
That last one must have been Julian's good looks. Every time I showed pictures of our session at work, the ladies would be "so who's the cute guy you were presenting with?" The Joe model co-presenter didn't elicit that kind of reaction... :)