My favourite throw has to be either:
O-soto-gari
or
Yama arashi - also known as mountain storm.
I love the second one because its fabulous for turning someone's running-at-you-full-tilt-energy into catapulting them across the hall.
Whereas the first can be used to great effect when you are walking towards an opponent.
Damn i miss being able to train

PiB