Our good friend Dr. Neil has put together a few demo Sidebar/SideShow gadgets, one of which is a cool Route Finder gadget using Virtual Earth technology!  It's a little rough around the edges, but it's pretty cool, and shows how easy it is to write a combined Sidebar/SideShow gadget using JScript.  You can download the gadget here: http://www.roodyn.com/sidebar%20route%20finder.ashx

While I was busy in Barcelona at TechEd: Developers, Dr. Neil was busy in Las Vegas at DevConnections standing in for me and giving some presentations on SideShow.  Check out his post containing links to his slides and another Sidebar/SideShow demo gadget he developed: http://drneil.blogspot.com/2006/11/devconnections-presentations.html