OpenBSD 3.8 was released November 1, 2005. This is the 18th release via CD (and 19th via FTP).
Though I haven’t tried OpenBSD, I have heard really good reviews of it. It is having a great record for 8 years with only a single remote hole in the default installation. Here are the mirrors where you can download OpenBSD.
Anybody have tried OpenBSD, please put in your valuable comments here.