I have a staff of about a dozen writers, including 8 who contribute on a very regular basis. I have a form letter than I email when I bring someone on board, basically outlining expectations and steps in the process of adding the writer (having them set up a Gravatar, giving me a brief bio, etc). I’m careful not to actually impose any requirements on them – basically, I’m just trying to simplify the process.
In terms of money, I lay out a profit sharing agreement where I share any profits (after deducting direct costs such as hosting) on a per-article basis. Write 10% of the articles, get 10% of the profits.
None of the writers really seem to care much about money, though. They just enjoy having a platform.
.-= Kosmo @ The Casual Observer´s last blog ..Should the Blue Jays Tamper? =-.