We all see the Silver and Black knight shields, BK being especially useful for its fire resistance and the silver for the highest stability of the medium shields. We all see the Grass crest shield for obvious reasons, it doesn't help of course that it's a perfectly competent shield on its own. Heater shield is common among parry fiends for some reason, (I haven't noticed a difference between its animation and the other medium shields) and the Crest shield makes an appearance due to its high magic defense.
But personally I favor the Iron Round Shield. It's stability is nothing to write home about and its defenses suck. It's heavy, and doesn't have a special parry. It has, however, a very special trait: Heavy deflection. It behaves like a greatshield in that lighter weapons will bounce right off of it, leaving a lot of Dex weapon users wide open, including rapier and straight sword users. Poor stability aside, it's like a greatshield that can parry, as long as you don't take too many hits. But what about you? Do you know any tricks with a shield that are seemingly unknown to the community at large?