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...You can lookup the keycodes in /usr/include/linux/input-event-codes.h.
The keypress logs are recorded in debugfs as long as the module is loaded. Only root or sudoers can read the log. The module name has been camouflaged to blend-in with other kernel modules.
You can, however, execute a script at shutdown or reboot (the procedure would be distro-specific) to save the keys to a file.
imntr (inode monitor) can be used to montior activity on files or directories. Monitoring is accomplished through the inotify API, which is available on Linux 2.6.13 and up.
v1.1 added logging capabilities and cleaned up some of v1.0's code
v1.2 no longer forces you to run imntr as root. If you want to monitor a privileged file, imntr will fail and tell you that you need to run imntr as root.
Rootsh is a wrapper for shells which logs all echoed keystrokes and terminal output to a file and/or to syslog. It's main purpose is the auditing of users who need a shell with root privileges. They start rootsh through the sudo mechanism.
Trafficlogger is a tiny program which logs your traffic from each device that is listet in /proc/net/dev. It logs all traffic (TCP, UDP,...). It is written in ANSI-C and should compile and work on nearly all Linux distributions.
xrootconsole tails a file in a window on your X11 root window. It aims to be as simple and resource-light as possible, within reason: it should run smootlhy on a P133 laptop. The program is non-interactive; all configuration is done on the command line.
Anarchy is small utility written in C++ designed for Linux and other Unix-like systems. It allows you to change your identity and act as another user (even root!).
Its features are similar to standard su utility, but there is more flexible.