Zmarties

In the same spirit as Google Suggest, bITFLUX also offers a LiveSearch feature where they come up with pages that match your search query as you type it, and offer them in a drop down list attached to the entry box. (Unlike Google, this is giving you the actual search matches, rather than simply a list of search terms - but the UI idea is the same).

This feature, explained in the bITFLUX wiki went live before Google's. Its available for use on other sites, under an Apache license. There's a list on the wiki page of 8 such sites that are using the code.