[Distutils] Setuptools - Removing Old Packages

I'm using easy_install for managing automatic updates to an application. I include the "--multi-version", "--upgrade", and "--install-dir" options, so that only an egg is copied to the directory I specify. I see that the current recommendation is to manually remove old packages, since there isn't an uninstall feature of setuptools. How would I go about detecting obsolete eggs myself, so that I can remove them programatically after downloading the latest version of an egg? Thanks, Marcus