A system to test blog/forum-comments for spam in real-time: http://blogspam.net/
A list of pubs in Edinburgh: http://edinburgh.io/
A mail client: http://lumail.org/
A list of pubs in Edinburgh: http://edinburgh.io/
A mail client: http://lumail.org/
(I've got stats going back the past two months or so, when the server was reimplemented in node.js.)