Books in the mist...

It would seem the site I was thinking of is http://www.bookcrossing.com/ (although I'm sure I've heard of others I couldn't find any - easterbunny, can you recall anything about that copy of Catcher in the Rye we saw in Gatwick?). Anyhoo, I've signed up, just need to read the book and then off it will go. w00t!
That's the main one I know of - that copy of Catcher in the Rye said "I'm not lost!" which is the main BookCrossings greeting. Also, that bit on TV we saw about it talked about the journalling site, which is also a BookCrossings feature.