The link below will take you to a form to fill out on Craigslist.com It's fairly self-explanitory.
Craigslist.com (Post Classified Form)
Craigslist Homepage (Los Angeles))
NowCasting.com A Very Useful Casting Tool
NowCasting.com (Post CastingCall)
NowCasting.Com (Homepage)
So far I've only found the above two, let me know if there are others (BenevolentGrudge@hotmail.com)
Soon I will have a list of actors who are assholes and you won't want to work with.