A simple keylogger written in python. It is primarily designed for backup purposes, but can be used as a stealth keylogger, too. It does not raise any trust issues, since it is a set of [relatively] short python scripts that you can easily examine.
Loganalyzer for Windows XP Firewall and Linux Iptables firewall. Generates a nice html document with statistics from all the pakets captured by the firewall. The program is written in Python and has an (optional) graphical interface.