Just recently got back from MIX09 conference at The Venetian in Las Vegas. This is a great conference for web developers, graphic designers and user experience engineers and those who aspire to be one. Although it's Microsoft-centric for the most part, there are sessions for everyone and they have posted all of the sessions online so that everyone can see them!
My favorite sessions:
- The Day One keynote
- State of the Art in Web Site Design on Microsoft SharePoint - Chris Auld
- Escaping Flatland in Application Design: Rich User Experiences - Peter Eckert & Jeff McLean
- File|New -> Company: Creating NerdDinner.com with Microsoft MVC - Scott Hanselman
There was also a nice workshop about design for web developers. Unfortunately, it's not on the web for viewing.