The most recent stable release of Cheetah v2.2.1 which was released on June 1st, 2009.
You can keep up to date with release candidates or other downloads of Cheetah by visiting the cheetahtemplate GitHub page
Note to Windows users: You should install the compiled version of Cheetah’s NameMapper. It is dramatically faster than the pure Python version, in the source tree you can find compiled versions for Python 2.4: namemapper.pyd2.4, Python 2.5: namemapper.pyd2.5. Install it wherever your system puts Cheetah/NameMapper.py. Strip the version numbers off the filename.