Divine Favor: the Paladin begins a series I wrote for Open Design meant to expand the options available to divine PCs. This includes new archetypes such as the Templar who carries a piece of the divine within himself, and the Metropolitan, a defender of the urban world and who possesses a sacred link to cities, but also alternate class abilities such as divine aspect. Divine Aspect allows the paladin to infuse his very flesh with the power of his deity, granting him greater strength, resilience and combat prowess.
There's also suggestions on to build a paladin PC with regards to ability scores, and spell and feat selection.
The series will also cover the cleric, oracle, druid and inquisitor.