In case you haven't seen it: http://msdn.microsoft.com/events/pdc/after
You can order a DVD with PDC presentations and slides. The price is a bit steep, but if you think it's worth it...$200 for attendees and $500 for everyone else. Pretty expensive, in my opinion, especially knowing that you're not getting precon, labs, or keynotes. If that's too pricy for your palette, you can get some of the slides for the main sessions.
Also mentioned on this site is that the Longhorn preview is available to MSDN users.
Another helpful link: http://microsoft.sitestream.com/PDC2003
[Updated Sat, Nov 29, 2003 17:21 UTC]