pip-Win is a tiny Python Package manager for Windows. It automatically installs pip and virtualenv. Its GUI lets you:
switch from one python interpreter (i.e. version) to another (including py and pypy)
see all installed packages, and whether they are up-to-date
install or upgrade a packages, or upgrade pip itself
create and delete virtual environments, and switch between them
run the IDLE or another python script, with the selected interpreter
See the Home page for screen shot and user guide.