I have this neat idea for a Palladium game sourcebook. What are the chances of getting it published?
It all depends on your skill, and the content. The guidelines for submissions are at the following address: Palladium Unsolicited Manuscript Release Form. Note that stuff released on the internet CANNOT be considered for a book, but CAN be submitted to The Rifter. A good article on how to write freelance for game companies is at the following site, by one of the most prolific GURPS freelancers for Steve Jackson Games, David Pulver.