General stuff that maybe should be at the top (esp for those new to Python):
Python is written in C, and is known as "CPython" when talking of other implementations to avoid confusion.
A fork of CPython with (micro)threading, task scheduling, and infinite recursion (yikes!) is Stackless Python.
PyPy is Python written in Python. It's available in different versions/modules:
- without Just-In-Time compiler
- stackless (like Stackless Python)
- sandboxing version
Jython: Python in Java bytecode (not to be comfused with JPython... Jython replaces this).
[IronPython: Python for .NET and Mono, written in C#. *news: [url=http://pytools.codeplex.com/]Microsoft as brought out a Beta version of Python tools for Visua Studio](http://ironpython.net/)