Honestly, I really don't know that a 'What is PbPRP?' is necessary. People that find this site will either already know, or will think it's perhaps about video games/LARPS and probably not be interested, and I can't imagine that those people that stumble across the site accidentally would go to the articles and guides section. Then again, perhaps it could be stickied somewhere [i]really[/i] obvious if the administration think it's a good useful article. If you write it, I would, as you plan to, keep it short. Advanced theory will bombard a newcomer and, as I say, I think it's the least useful of the three articles.

Another idea for a simple guide, possibly inspired by the B!tch thread, might just be a 'do's and don't's'. Your guides are excellent and I'm personally very interested in the various theories behind RPing, but I'm a freak and I expect the people that might tend to read an in-depth article might perhaps have a greater interest in the ins-and-outs of RPing and, not to mince words, might be a better RPer as a result. However, a more simple guide of 'do's and don't's' might be more accessible to a greater number and might result in a more tangible improvement in the RPing of those that read it. A guide would be more advantageous than a pile-up thread like the B!tch thread because it can be more easily formatted and, frankly, doesn't meander off into bickering or more cordial debates. That said, you clearly do enjoy (or at least get some personal reward from) writing advanced theory guides, so if you don't fancy doing a 'do's and don't's' guide, I might give it a shot.

For the player guide, I definitely think the focus should be on character creation and post content. Perhaps you could note how a more interesting character can be made by making sure they have a personal conflict that, if not directly reflecting the overall conflict and themes of the RP, can be explored and developed through an RP, creating a character arc expected from every other traditional written artform with characters (and why should RPs be any different?). I'm not sure that notion is really present in players' consciousnesses. Also, what you call the action-reaction wheel (which I believe is what I less eloquently call the 'making-sure-your-post-doesn't-kill-the-flow-itivity') is definitely key, as killing the flow seems to be what kills RPs more than people spontaneously vanishing in my experience. I'm not sure player etiquette is the most important content to focus on. Either I need enlightening myself (in which case perhaps player etiquette is something I should brush up on!) or it just comes down to, like so many things, not behaving like a douchebag, which we should trust most people to know how to do.

I'm a crap GM, so I can't even speculate as to what might or might not be useful to know. xP