That's right, PDC has been rescheduled to Oct. 27-30 2008 in Los Angeles, California.  Here's the info from their :

PDC 2008
October 27–30, 2008
Pre-conference October 26, 2008
Los Angeles, California

OK, OK. We are delighted to announce the date and location of the next Microsoft Professional Developers Conference (PDC): October 27–30, 2008 at the Los Angeles Convention Center. PDC is the definitive Microsoft event for software developers and architects focused on the future of the Microsoft platform. Mark your calendars and save the date. More information coming soon.

Looks like I'm ditchin' TechEd for this one! ;-)