Now this is an intriguing happening. A respectable group of 40k net-celebs have joined forces in an effort to create a new online community. Their goal (which I share) is to create a respected central body that publishes and certifies fan created Codices and other rules. They have a vision of clubs and even some tournaments allowing the use of alla new online community certified Codices. Check out The Codex Project for the lowdown.
There might be something you can do to contribute! Rules, photos, artwork, layout, playtesting, editing and fluff writing are all required for a TCP codex. They are built by a team with a single leader - but that leader will be changed if progress stalls. They anticipate that it will take a long time for a Codex to reach certification from scratch - perhaps in the realm of 6 months to a year.
After hearing about the site on an episode of The Overlords podcast, I got very excited and went straight to the site. Ended up my introductory post on the forums was their virgin post! I have started posts linking to each of my fan Codicies - the Crimson Fists and the Death Guard. I am happy to contribute these rules to TCP in the hope of seeing some set of rules certified for these forces.
Oh by the way I have another Codex in the works - hopefully I'll have it ready to publish in a couple of weeks. Sadly I don't enough models to give it a proper playtest but hopefully TCP can help with that.
Send in the clowns...