A. Additional gadgets for Vista Sidebar are available at http://gallery.microsoft.com/Results.aspx?vista=landing&rdm=593944&l=1&ti=2 . After you download the .gadget file, execute it and you'll be prompted to install it, as the figureshows.
After installing the file, click the plus sign at the top of the Windows Sidebar screen to make the new gadget available. To uninstall a gadget, simply right-click it and select uninstall.