You will have to have JavaScript activated, and not all Bookmarklets work with both IE and Netscape, but they are free for use. Details in the story below. These software packages will allow users to search for a variety of audio files, including MP3s, .mod files, MIDI files, and .wav files. Both packages are expected to be available November 1. Interesting with this notification service is that it can send you notices by e-mail, ICQ, or AOL Instant Messenger.
Webmasters can also put spies on their own sites so users can keep up with when pages change.
Google is also introducing GoogleScout, a related URLs feature. Type a search term in the search box. I tried GoogleScout with the search word XML and it worked pretty well. All the links are on one page in fast-loading, alphabetical order. It's a meta-index of search engines broken out by country.