The most recent stable release was 2.0.1 on November 16th, 2007. Cheetah has been stable, production quality, post-beta code since 2001. All new releases since then (40+) have been almost 100% backwards compatible. The 2.0 code itself has production ready since early 2006.
Here's the documentation on recent changes.
You can also get the current unreleased development version of Cheetah from our CVS repository.
Cheetah is included in FreeBSD and most major Linux distributions: Gentoo, Fedora, Debian, and Ubuntu among others.
IMPORTANT NOTE TO WINDOWS USERS: You should install the compiled version of Cheetah\'s NameMapper. It is dramatically faster than the pure Python version! 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.