this app is useful up to a point, but you should be wary when using it:
it flagged up 22 dead links after scanning my del.icio.us bookmarks. looking through the list, i noticed a few sites that i knew for a fact were not dead links. so i tested each link on the list and found that out of the 22 only 7 were actually dead. the rest either loaded perfectly in my browser, or were pages which required a login [which seems to cause dead.licious to flag them as unreachable].
so, yeah. it narrowed my search for dead 'uns down from a couple of hundred to 22, but i still had to manually check each one to remove the live ones from the list before telling dead.licious to delete the remainder from my del.icio.us account.
and i can't help wondering; if it mistakenly added live links to the list of dead link, did it also err the other way and fail to add some that were actually dead?
so, all in all a fairly useful app - but i'd advise you to doublecheck its results before asking it to delete stuff from your del.icio.us account