The 2003 PDC was my 5th PDC. I'm usually pretty hard core about absorbing as much as I can but the 2003 PDC pushed me to my limits. I rarely ate in the eating area. It was usually gotten to go so I could run off to the sessions scheduled during lunch.
My first suggestion is to *not* schedule sessions over lunch. Give folks a chance to take a breather and talk to other attendees over lunch. My second suggestion is make the wireless network more reliable. Finally, I enjoyed previous PDCs where there was
a PDC mailsystem that allowed you to find other attendees (folks you might not have seen in a while). In general Microsoft puts on great conferences ('98 PDC excluded) and takes good care of the attendees.
PS. I loved the Snickers Ice Cream bar snacks! Yum.