LSM (Loadable Security Module) is a very simple but effective intrusion prevention loadable kernel module. Current functionality involves protecting extended file attributes on ext2 from being modified by the super user and the module from being removed and other modules from being loaded. The basic protection also prevents access to raw devices, so debugfs can not be used on a disk partition nor can a change to the boot process occur. You will not be able to reconfigure lilo, if the module gets activated.
Cdred is a Linux driver and two programs that enables *any* CD player software (xfreecd, gtcd, etc) to use audio cdroms inserted in another computer. In other words: you can listen an audio cd in a Linux box that doesn't have that cd inserted. Cdred works on all 2.2.x kernels, support for 2.4 will be implemented soon.
Circus Linux! is a clone of the Atari 2600 game "Circus Atari." The object is to move a teeter-totter back and forth across the screen to bounce clowns up into the air. When they reach the top, they pop rows of balloons and then fall back down. If you don't catch one, you lose a clown.