As I am now in the process of budgeting for next year's run of conferences I would like to speak at or attend, I noticed (along with many others) that the next Professional Developers Conference (PDC) is schedule for next September:
September 13 - 16, 2005
Pre-conferences September 11 and 12
Los Angeles Convention Center, Los Angeles, CA
I had to miss the last one unfortunately, but this is definitely one I want to attend.