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The new advanced search features in Delicious allow you to search the context of the page you're on. What this means is that if you're looking at a specific user's bookmarks, you can search their bookmarks. If you're looking at a specific tag, you can search only items with that tag. It will also let you search tag intersections as well as user + tag. Select "These Bookmarks" from the search box dropdown and experiment, it's much easier to do than to explain!
The other new feature is the ability to search your network's bookmarks, just as easily as you'd search your own. So if you're trying to find a bookmark from someone in your network, pick "My Network's Bookmarks" from the drop down and search away.