Apple has posted the first set of scheduled sessions and labs for this year’s WWDC here: Worldwide Developers Conference 2009 – Sessions & Labs.
Off the top of my head I think I will be keeping an eye on:
Cocoa Tips and Tricks
Concurrent Programming in Cocoa
Effective iPhone App Architecture
Embedding Maps in iPhone Applications
Performance Tuning with Shark on Mac and iPhone
User Interface Design for iPhone Apps
Which ones do you have your eyes on?