Cocoalicious:

Cocoalicious is a freeware client for the popular Del.icio.us online bookmarking service. Upon first launch, Cocoalicious will download all of your online bookmarks and tags for quick viewing within the application. It also has a rudimentary browser window for viewing the source of individual bookmarks without the need to open them in an external browser. Posting new bookmarks to your account is easy, too. Highlight some descriptive text from an article, hit the included bookmarklet and enter some tags for your new bookmark (Cocoalicious will autocomplete your partially typed tags for you). Cocoalicious makes managing your Del.icio.us bookmarks easy and fun.