This is a very cool thing, and very handy, too. But I wonder how they do it; is it some kind of compression algorithm, or a gigantic hash table? I'm betting the latter, as the links seem to appear in sequence. But that worries me; the hash table has to be stored somewhere, and that means they will, eventually, run out of space.
This has been an example of "high-context"; the David Mamet of blog entries.