@Chip Bennett - I actually don't want to deal with any more registered users on the site. Also, those people would need to become dedicated writers if I were to go though the trouble of adding them as a contributor. I'd rather have a system that I didn't have to worry about user permissions anyways.

@Dave Bullard - There is a plugin that will be released some time in the future that will enable you to easily have a post submission form on your site but I have no idea when it will be released. Maybe this will encourage Michael to rework the plugin into something more people can use.