PyPy
PyPy is a Python implementation in Python. Yes, it can interpret itself!
Please refer to the PyPy home page for more information about this upcoming Python implementation.
PyPy 1.0 was released on 27/03/2007 https://codespeak.net/pypy/dist/pypy/doc/release-1.0.0.html
It includes a JIT compiler, stackless-like functionality, uses the Boehm garbage collector and has whole lot of "backends" - C, LLVM, JavaScript, CLI, Java.
PyPy 1.1 was released on 28/04/2009 https://codespeak.net/pypy/dist/pypy/doc/release-1.1.0.html
Some of the backends supported in 1.0 (namely The LLVM and the JS backends) have been dropped "because they were unmaintained and/or buggy". The old JIT has also been dropped in favor of a new one that is under active development.