Jaime Rodriguez On Windows Phone, Windows Presentation Foundation, Silverlight and Windows 7
This is an FAQ and I just shared it via email w/ someone, so sharing it for future:
http://blogs.msdn.com/sidebar/ -- Sidebar Corner == the sidebar PMs’ blog
http://microsoftgadgets.com/Sidebar/DevelopmentOverview.aspx - Sidebar development overview
There might have been a few API changes since beta2, but for the most part this paper is great for a sidebar newbie..
http://gallery.microsoft.com/vista.aspx - The sidebar repository where users are posting gadgets ..
http://microsoftgadgets.com/forums/10/ShowForum.aspx - The sidebar forums..