With this gadget search the domain name of your choice, and check if it is free.

Flickr Photo Search Gadget, Search directly at Flick.com

The eBay Explorer gadget allows you to search and browse products and auctions on eBay.com

With this gadget search on residential phone directory directly from your Windows sidebar.

 
With this Discogs.com gadget search on an online database of hundreds of thousands of music titles, rare vinyl information and album art.