Site search powered by Google site map?

Hi,

Whenever I do a site that is mostly static but with some semi-dynamic
sections, I've struggled to find a good site search solution without
paying for a hosted search service.

I like the FSO-based search engines, but they fail to pick up on some of
the dynamic part.

I was just creating a Google sitemap and it made me wonder: has anyone
created or seen a script that uses the XML Google sitemap to power a
search engine for your own site?

Seems like if you were keeping it updated for Google, why not use it for
your own site?

I can do some cusory ASP reading of XML, and I expect it would be
possible if someone really knew what they were doing.