aseepish

Osotogari - for one (at least in my experience)
Harai goshi
The various foot sweeps (ashi-waza)
Some say uchimata, but my uchimata sucks


Not much of a list, I'll admit. It's true - if your center of gravity is naturally lower than your opponent's you are already at an advantage.

Found this link with others' opinions on the matter
http://judoforum.com/index.php?showtopic=7248&st=12

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