Xbox Media Center contains Python 2.4 inside.

XBMC provides python a way to create graphical user interfaces, access to read infomation about the xbox and ability to extend XBMC features by allowing scripters to create scripts for specifc sites to download and allow you to watch content from. You can also use python in programming a web interface.

About Python

Python® is a dynamic object-oriented programming language that can be used for many kinds of software development. It offers strong support for integration with other languages and tools, comes with extensive standard libraries, and can be learned in a few days. Many Python programmers report substantial productivity gains and feel the language encourages the development of higher quality, more maintainable code. Quote: Python.org

XBMC Python Scripting Community

XBMCScripts.com Hosts scripts for public use.
Google Project Hosting hosts project tools and a svn for developer

Useful links on the XboxMediaCenter.com

Building Python Scripts
Using Scripts
Python Scripts Development Developers forum for XBMC Python Scripts. Script writers only!
Python Requests, suggestions, support and everything else goes in here!