All the info is in the other answers, but none summarizes both your requests or seem to make things needlessly complex:
For your removal needs use:
pip uninstall <package>
(install using easy_install pip
)
For your 'list installed packages' needs either use:
pip freeze
Or:
yolk -l
which can output more package details.
(Install via easy_install yolk
or pip install yolk
)