(via roland), a new tool that seems really promising: Durl. To put it shortly, it's a search engine for del.icio.us.

Enter a url to retrieve information about people who delicious'ed it. del.icio.us already provides this service, Durl completes that with an RSS feed containing those results and trend history graphs.

As Roland points it the added value is related to the keyword (metadata) added:

And this is very efficient because it leads you to people who not only bookmarked the URL, but also assigned to it some pertinent keywords or tags, giving you new and fresh ideas.