Google Custom Search allows anyone to create his or her own search engine. The benefit of this is that you can create a very subject specific search environment. One such use that I found through The Whiteboard Blog is a SMART Notebook search engine. As you would expect from the name, the SMART Notebook search engine is designed to help you find resources designed for teaching with SMARTBoards.
Via Beth Dichter
If you have a SMARTBoard you may want to check out this Google Custom Search Engine that allows you to search only for resources (in this case designed for SMARTBoard). There are many excellent resources available and how you may be able to find them more quickly.