I've been using a Greasemonkey script on del.icio.us archive pages to separate posts with comments from those without, since merely knowing that some random user also bookmarked some URL is pretty much useless, as far as I can tell. I'd planned to throw it out in the wild after I made a few more changes, but it looks like the del.icio.us folks have released a new design that obviates that plan.
The new archive pages are much more useful. Interestingly, Greasemonkey scripts are the only code I'm happy to see break.