Check out CollaborativeRank, a search engine that identifies subject-matter experts based on what they bookmark, and how popular their links are. This tool offers you some real benefits:
1. You can search on any subject and get excellent results
2. You can identify experts in the subject on which you are searching
3. You can subscribe to that expert's bookmarks
How does it know what people bookmark? It's getting the information from a service called del.icio.us, which allows you to bookmark sites for later use by giving them tags.
How can you subscribe to an expert's bookmarks? You subscribe via RSS (Real Simple Syndication). If you're unfamiliar with RSS you can read more about it here.
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