Off and on, in between other things that have come up today, I've added support for del.icio.us to BottomFeeder. In this case, support means that you can post a set of tags for an item to del.icio.us, or change your mind and delete them. There are other aspects of the API that I haven't added; I'll have to think about those (not from a hard to do standpoint, more from a "how does it fit in Bf" standpoint). I should have an update available for the dev stream shortly