You can also put requests in at conceptart.org or even throw an ad on craigslist. Just make certain to see examples of their portfolio before negotiating a price.
Unless its 2001 and your company's documentation is stored on a shared drive. Heck, when I graduated in 2009, my college was still keeping all of its documents in a maze of ntfs shares.
You don't have to be the first to lay the groundwork either.
The true achievement of Wikipedia is not in its content, but its groundwork. Every company should maintain its own internal and external wikis, even if only employees can access or modify them.
It simplifies distribution of documentation and files in a very user friendly way.
And let's face it. Whack jobs write books and news paper columns too. Wikipedia has a surprising amount in common with college text books.
Most of the angel groups I've looked at won't sign NDA's. They expect you to be at a point where you are ready to disclose your project.
As much as we want to be the first to announce or offer our idea, producing a good product is far more important. The honest truth is that you will have competition, no matter how secretive you are. You can't hide the idea if you want to make money.