RPGs are unique in gaming in that they typically require a Game Master (also Dungeon Master, Judge, or Referee). They are categorized as having very few limitations for players, thick rulebooks, and the need for imagination. They can be played with or without miniatures, online or off.
Outside of these links there are also a multitude of RPG resources on personal blogs and even more system-specific resources.
Currently the highest ranking RPG podcast. Be warned, language runs amock.
Venerable RPG podcast. Great discussions on all things in the hobby.