cfflib is available from NeuroDebian.
Please add Neuro Debian to your package index and type:
sudo apt-get update
sudo apt-get install python-cfflib
Note
This works for Ubuntu 10.10 and 11.04.
If you want to clone the source code repository, you find it here:
http://github.com/LTS5/cfflib
And example data here:
https://github.com/LTS5/cffdata