One of the niftiest features of Windows 7 is federated search, which allows you to search websites within Windows itself. Just by downloading and installing a “search connector”, you can add Google, Flickr, Twitter and other sites to your computer, so when you type in the search box in Windows Explorer, you can not only search your local computer, you can search websites, too!
It’s kind of hard to tell from the above picture, but this person has added popular site deviantART to his Windows search, and has searched for “Windows wallpaper”.
To add additional search engines to your Windows 7 install, just go to this page and download any of the connectors you’d like. And thanks to the OpenSearch protocol, you can even add your own if you’re good with XML! Read more about it at the linked site.