Delimport is an excellent application that provides someone with a large number of del.icio.us bookmarks, such as myself, with absolutely seamless Spotlight integration. The application imports your del.icio.us bookmarks using the del.icio.us API and produces a local cache of them, allowing Spotlight to return your del.icio.us bookmarks as search results.
A QuickLook plugin for delimport's bookmark files that displays each one's appropriate information would be greatly appreciated. I look forward to the future if this is only release 0.3!
Highly recommended for anyone who uses del.icio.us and a Mac.