Here is a simple, yet very useful, python script for synchronizing contents of directories.
Tested under Mac OS X. Should work under Linux. I don’t know (or care) about Windows.

Features

• Synchronize files between two directories
• Behaviour controlled through configuration file
• Batch operation mode
• No additional python modules required

Known Problems

• Situation, where dirs being synchronized contain a folder and a file with the same name, is ignored
• On Mac OS resource forks and other metadata is not being transferred (python shutil issue)

> Download here

This software is in early stage of development, I would appreciate if you would give me some feedback.