In addition to Googlert, Mike Dierken points out SearchAlert, a similar service he has set up that doesn't require you to have your own Google API key.

"SearchAlert.net helps you stay on top of the latest news and information from the Web. It is simple, easy and free - the way it should be.

As a SearchAlert.net subscriber, you enter search terms and then SearchAlert.net continually monitors the big Web search engines and sends automated e-mails to you when new results appear.
We do the work so you don't have to!"

I just now signed so I haven't received any notices yet. Mike notes that he'll be "adding posting new results to blogs via the Blogger API 'real soon now,' " which would certainly be useful, but I'd like to formally request notices via an RSS feed.  :-)