Just found a couple of new bookmarklets for del.icio.us that are extremely useful.
The first is nutr.itio.us, which replaces the del.icio.us pop-up posting window with one that includes your tags, as well as an option to view the del.icio.us history for the link so that you can see how other people have tagged it before assigning your own tags. Brilliant!
Another useful tool is Tasty!, which lets you simply view the del.icio.us history for a link to see who's bookmarked it. If you're just curious, and don't want to bookmark it yourself, this one is nice--the rest of the time, the nutr.itio.us approach seems more useful.