Delicious has introduced a "Bulk Edit" feature, that allows users to easily share, unshare, tag, and untag numerous bookmarks all at once. The feature is simply a way to make the social bookmarking service more usable.

Dave Dash gives a few examples on the Delicious blog:

Editing holiday wishlists

Sharing bookmarks you imported as private

Marking private those NSFW bookmarks before you share your delicious age with mixed company
Refining your tags for maximum awesomeness

One feature that is not available however, as one commenter points out, is the ability to bulk delete. This would actually be a useful feature as well, and Dash was kind enough to respond and hint that Delicious would be looking into this, and possibly include such a feature in the future. So do not be surprised when that comes.

Source: www.webpronews.com