WordPress plugin for multiple bookmarking sites?

I was on a site — can’t remember which, darnitall — that, for every post, had a row of framed favicons from something like a dozen different bookmarking sites (del.icio.us, Bloglines, Technorati, etc.)  One click would add the post to your favorite flavor.  Anyone know of a WordPress plugin for this?  Or am I going to have to roll my own?