This article in Search Engine Watch notes that Delicious (www.delicious.com), which was recently purchased from Yahoo by the co-founders of YouTube, has the potential to be a next generation search engine. Why? Because we are more likely to look at content that has been pre-filtered and flagged by our friends, family, and colleagues. For example as a software engineer I may be looking for information about a new feature the Java programming language. If I search the term in delicious, I will find many links that have been tagged with that term.
Here's the link:
Is Delicious the Next Discovery Engine?