Thanks to the work of Kelly White you can now have the Silverlight Tip of the Day appear in your Vista Sidebar as a Gadget
Kelly has graciously made the script available here. Just unzip the file and place it in your gadgets folder, all explained in detail in this article.
Once the gadget is in your dock;you can view the current tip or click on View All Tips or click the Silverlight logo to go to the Silverlight site. Finally, if you click on the story, the "fly-out" shows you more in place, and offers to take you to the full article:
You can pull the gadget out of the dock, allowing it to float free. Settings allow for a larger or smaller size when undocked.
My sincere thanks to Kelly and to whoever wrote the Visual Studio gadget