im not expecting anything, but imagine how cool it would be
Also look in Show Business Weekly. They usually have a listing of projects for which extras are needed.
Do a mailing with a head shot and resume to the extra casting directors, then follow up with them after a short time with a post card and a phone call if you have set your cover letter up that way to have them expect your call.
Good luck!
Tony
http://www.actingcareerstartup.com