NetBSD, considered one of the most secure operating systems around, is now available in the 3.0 release, bringing a multitude of changes and a lot of new features. Things such as SpeedStep support (a long time in coming, that), new wireless and gigabit support, better VPN and many others. There's a full changelist at NetBSD's
site which you can peruse. This is of more interest to people maintaining BSD-based servers, but cool stuff nevertheless.