I have been working on SecOS lately. It is sort of a mini-distribution geared towards (fairly generic ;-) appliances. It is based on RedHat, but there is only a minimal set of packages, sufficient to run eg. firewalling software, and some custom stuff has been added.
Also, the kernel is a bit modified : I've put both grsecurity as well as RSBAC in it.
The base OS image is now here, but the installation script and the RSBAC settings still need some tweaking...
Furthermore there is a presentation on SSH upcoming where I should show some practical stuff re. SSH usage and features ... Good thing I went to Dug Song and Solar Designer's speech @ HAL2001 ... this gives me some ideas ;-)