The only drawback is that you have to install the libraries by hand. The required libraries are: Qt, pyQt. Furthemore, having "konsole" installed is recommended (otherwise you have to edit the config.py file). konsole is usually found in the "kdebase" package.
cvs -z3 -d:pserver:anonymous@cvs.sourceforge.net:/cvsroot/onefinger checkout onefinger
This will create a directory called onefinger in your current dir, and put the source code in it.
Then, periodically, to keep your version on par with the current version, enter the directory onefinger and type:
cvs update -dPand your local version will get updated.
You can also browse the source code online with sourceforge: simply click here.