"Vibrissae (singular: vibrissa), or whiskers, are specialized hairs (or, in certain bird species, specialized feathers) usually employed for tactile sensation." - Wikipedia
Reason behind Whiskers
Why? Shortly to automate your workflow.
Think an environment where you're managing tens or hundereds of buildouts - say Plone instances. Most of them have probably almost same packages and almost same versions. Now you make an critical fix to some custom package and you need to know which buildouts you have to update. Whikers helps you here by knowing what is required and where.
Whiskers 1.x is developed with Python 3.3 and tested with Python 3.2. If you are for some reason tied to Python 2.x you can still use Whiskers 0.2.
virtualenv --no-site-packages -p /path/to/python3.3 whiskers cd whiskers bin/pip install whiskers wget https://github.com/pingviini/whiskers/raw/master/production.ini bin/pserve production.ini
virtualenv --no-site-packages -p /path/to/python3.3 whiskers git clone git://github.com/pingviini/whiskers.git cd whiskers python setup.py install bin/pserve production.ini