If you haven't seen it already and you're interested in SharePoint 2007 development, go grab the ECM Starter Kit at http://www.microsoft.com/downloads/details.aspx?FamilyID=38CA6B32-44BE-4489-8526-F09C57CD13A5&displaylang=en
It includes the workflow templates and activities for SharePoint so you can start using them inside of VS and the Windows Workflow Foundation dev environment. It also includes a bunch of information and samples on digital signatures and also extending the Records Management capabilities in SharePoint.
Quick update from TechEd. After spending 8 hours in the dungeon (the area behind the keynote stage) yesterday, it was great to see Bobmu and Chriscap nail their keynote that we worked a bunch on.
I'm going to be in the booth later today so if you want to, swing by and say hi. It's always great to meet other folks who are passionate about Microsoft technology, especially SharePoint!