Oooh! This is very nice; I’ve just slapped their service all over the Creative Stoke directory. Amazingly, it all works from a single line in the page headers, that calls in a .js file containing JavaScript functions. Snap also makes it much easier for site-owners to check for dead links by hand, and I’ve just used it to check the entire Creative Stoke directory for dead/moved links, without opening a single new window.