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/
Interested in blogspam, do you have some overall stats, akismet style? http://akismet.com/about/
(I've got stats going back the past two months or so, when the server was reimplemented in node.js.)