This new search feature in Windows 7 lets you search content on remote locations right in side Windows Explorer. Now from the desktop you can search different websites without having to open a new browser session.
Several different connectors can be found on the Internet. Once downloaded, the file in question should have a .osdx extension.
When you double-click the file, a dialog box will ask if you wish to add this connector to Windows.
If you click on the Add button, the connector should appear within Windows Explorer. To use the entry, click on it within the left column and use the normal search dialog box near the top right-hand corner.