Pinboard/Delicious/Yahoo! bookmarks manager.

Great improvements, but this also highlights how counter-intuitive/confusing Ubiquity commands can be (see my comments on the post - it took me ages to work out how to use the new features, and I still can't do my usual 'quote something from the page I'm bookmarking, then add my own comment' thing).

Searches page content of your del.icio.us links. Not working at the moment ("We've been throttled by del.icio.us") but looks to be useful once it's up.

First thought: ooh, pretty. Second thought: Er, why would I use it in place of the website?

TagsAhoy lets you search all your tags, across different sites, from one location.

Requires Java plug-in

Nice little script that lest you post tagged pages from within NNW, via Cocoalicious or directly to del.icio.us. (Especially useful if you use MarsEdit to post from NNW to your weblog.)

Metafilter gets all folksonomical on our asses, but on the Flickr self-tagging model, not the del.icio.us bookmarking one, which seems wrong to me.