So far DrupalCon has been fantastic. I've attended many great sessions and had a great time with the fellow Drupalers. I will update with more info later, now I'm off to a new session!
So far, I have attended:
Keynote by Dries
Keynote by Tim O'reilly
Panel: The Many Flavors of Drupal Training
The state of Drupal as a Web Application & Product Platform
Monetizing Drupal
Going Vertical: How niche marketing can launch your Drupal business
Search Engine Optimization (SEO) for your Drupal site
Conversion Rate Optimization (CRO) for Drupal
Elevating 960gs in Drupal with the Omega theme
Defining and pitching your process
Making Drupal Admin Simple
I've missed a few in my list, I'll try to update it at a later point.