The links to the demos and the ppt decks from the SharePoint Workflow session I did at Dev Connections conf on April 23rd, 2008:  

 Download the PowerPoint Deck from the session here: Download 

Download the Demos here: Download 

Information on K2’s BlackPearl product can be found here: http://www.k2.com/platformoverview.aspx?id=462 

Download the Demo Instructions for HelloWorld Visual Studio Solution here: Download 

Download the “Build it from Scratch“ instructions for the Hello World VS.NET solution here: Download