So, earlier this year, I developed a simple system for resolving RP combat and advancing your character in World of Warcraft roleplay. I know that there are other systems out there, but the ones I've run across have either been too simple (they don't actually account for character style, experience, or uniqueness), or too complex (they bring it closer to playing an actual tabletop RPG into WoW, which can be fun, but... we're already playing one game. There's no need for another on top of it).
NB20 was designed to sit somewhere in the middle. It uses a simple point-buy system for attributes, and these attributes are then used to modify the in-game /rolls so as to allow a character some uniqueness among his or her peers.
The beta-version of the NB20 document can be found below:
The NB20 System: Combat Roleplay in the World of Warcraft
The list of existing (revised to match the beta document) stats for Netherbane members and allies can be found here:
Netherbane Member NB20 Stats Spreadsheet
Both of these documents will be updated as the system evolves over time.
If you've used the NB20 system and have constructive feedback, please feel free to leave a comment below. It's undergone a few tweaks here and there, but the testing pool has largely only been within the Netherbane, so it could use some extra eyes.