The presentations from PDC for WinFS just got posted. Checkout:
WinFS Overview by Shishir: http://microsoft.sitestream.com/pdc05/DAT/DAT209.htm#nopreload=1&autostart=1
WinFS Data centric applications using WPF and WinForms by Ramesh: http://microsoft.sitestream.com/pdc05/DAT/DAT310.htm#nopreload=1&autostart=1
WinFS and ADO.NET: http://microsoft.sitestream.com/pdc05/DAT/DAT312.htm#nopreload=1&autostart=1
Unless you are a developer, nothing more than the first 2 will be interesting. Fun times…