I absolutely agree about different riding maneuvers being useful in all sorts of situations, that's why I'm asking. :) I have a good horse and I want to become a good rider for him.
In most cases, the inside leg is the one you want your horse to either move away from or bend around. Let's say you're on a narrow trail and you have one of those horses with a sense of humor who likes to smack your knees into trees. In that situation, you would need to your inside leg, (the one your horse is about to slam into the tree) to move your horse away from the tree. Any horse should know how to move off a leg.
This is exactly my horse.
He is very mischievous around trees!
I am understanding the responses to this thread a lot better now and I have been wanting to get somewhere with lateral movement. I don't think I quite realized that the two things were related. Thanks for the info everyone!