After reading +James Spahn's blog post about spicing up his fighters for his B/X and Labyrinth Lord games, I've decided to do the same and share my variant Fighter class for Swords and Wizardry Complete.
While I've never had a shortage of fighters in my games over the last 25 years, I do think the fighter needs some extra oomph and a little more variety beyond weapon choice. The fighting style specializations are my attempt at doing so.
As a side note, "Maximum Weapon Damage" is a rule I use. Basically, I don't restrict weapon usage by class, but instead have a maximum size on the damage die based on class. So, a magic-user can wield a longsword, but he's only going to deal 1d6 damage with it. Fighters and paladins have no such maximum die, and always roll the damage die of the weapon they're using.