I teach wide stance, thighs parallel to ground, chest forward, throwing hand in fist behind glove, toes pointing fairly straight.
My daughter caught for about eight seasons and that is pretty much right in-line with what we picked up in clinics. One slight difference is the "toes pointing fairly straight".
I have heard to point the toes "outward" a bit- almost like you are pointing one foot up the first base line and one up the third base line. This is supposed to promote beter balance and make for a more stable stance. Also provides a quicker push off the foot if you have to move to the left or right and, when you pop up to throw, your foot is in a better position to drive off the back leg.
Another advantage I have heard with this is that pointing the feet outward takes some of the stress off the knee joint and focuses it on the larger, stronger thigh muscles. Saves wear on the knees and makes for a quicker pop up from the receiving position.
One other bit of footwork variation- instead of setting up with the feet "even", slightly offset the foot on the throwing hand side to the rear. This also is supposed to help with making quicker throws. When you pop up, your feet are in a more natural throwing stance. If your feet are even, you can tend to subconciously move your foot back to get weight on it as you start your throw.
Minor differences, but differences aimed at shaving precious fractions of a second off your throw-down times.
Knee savers- if my catcher wanted to use them, she had better use them right! She should NEVER have her weight resting back on them when in the primary receiving position. Use them between pitches, when giving signs or during breaks in the action the save a little wear-and tear on the legs. But when the pitch is being thrown, you need to be in the "thighs parallel to the ground" stance- that means weight OFF the knee savers! If your weight is back on your heels, you greatly increase the reaction time to come up out of your crouch.