The Windows Live Search team has a blog post entitled Add Search to Your Site with the Live Search Box which states

Today, we’re proud to announce the launch of the Live Search Box, to bring the power of search to your Web site or blog through a coo widget. 

When the user enters a query, the search box dynamically builds a floating <DIV> on your page to display the search results. You can customize the query in the first tab to search your site, your macro or anything else, while the second tab will return general web search results. The floating <DIV> will position itself appropriately, whether you decide to place the box on the left, right, top, or bottom of your Web site.

The search box also comes in a pure-HTML flavor:

Just a few days ago I wrote about Google Custom Search Engine, Live Search Macros and Yahoo! Search Builder. At the time I pointed out that although Windows Live was ahead of the game in enabling users to customize their personal search experience search macros, we didn't offer a good story for adding a custom search box to your website or building your own search engine on top of ours. Now we do.

I'm going to switch the search box on my weblog later today and give it a whirl. The built in search provided by dasBlog is quite slow and it would be great if I could offload this functionality to Live Search. Mad props to the Live Search folks for providing this functionality.