
I've seen links and references to del.icio.us floating around my RSS reader lately, but until this morning I had not checked is out.
About a year and a half ago I put together a ColdFusion Bookmark Manager back when I was trying to impress a potential employer who happened to be migrating from ColdFusion to PHP. At the time I had the germ of an idea very much like del.icio.us; multiple user support, ability to share links, and consequently the ability to do all the neat sorts of reporting that would provide... but I probably wouldn't have come anywhere close to del.icio.us' fluidity.
I signed up for my own account this morning, and I'm still getting familiar with all the nooks and crannies... already, though, I can imagine myself wasting hours and accumulating hundreds of bookmarks just by browsing the constantly-updated home page.
I'm trying to figure out what makes del.icio.us more compelling than linkblogs like Metafilter or memepool, and I think it has something to do with the merging of a personal service (bookmark management that's not tied to one browser on one account on one computer) with the community built around the sharing of cool/useful links. This is good stuff.