Delicious released some new features last night and one of them was a more prominent "search" field throughout the service.
I would be remiss if I didn't say that this is not intended to replace traditional web search.
This is about discovering links that others have posted to delicious. It's a subtle, but important, distinction.
But with millions of links, the results are pretty interesting.
And while you are at it, if you are using Firefox, you can add a Firefox plug-in that adds delicious to your choices in the Firefox search field on the upper right of the browser. It's available here.