Ben Hyde: If you drag this bookmarklet into your bookmark bar: Tasty? Then when visiting a page you can click on it to see how many people thought it was interesting enough to bookmark at del.icio.us. You can read their comments and category assignments.
Cool! I find the del.icio.us feed to be of less than fully useful as it doesn't have anything that I can identify as a permalink. Now with five lines of code, I can rectify that in my extractor script.
Ideally, at some point, people will converge on standard for feeds for link blogs, and these special purposes hacks can be retired.