1iota
www.1iota.com
sign up for an account online to apply for various TV & talk shows
if you can't score tickets right away, they do have waitlists
Audience Associates
www.TVTIX.com
free tickets for NBC, CBS, Fox, and Warner Brothers shows
Audiences Unlimited
www.audiencesunlimited.com
free tickets to various TV shows
On Camera Audiences
on-camera-audiences.com
Dancing with the Stars, American Idol, etc www.on-camera-audiences.com
Keep in mind that no company can provide tickets to all shows at all studios. For instance, tickets for most of the sitcoms which are taped at Paramount Studios can only be picked up at the ticket window at Paramount Studios in Hollywood so they tend to specialize / work with a few sister networks to make it easier for everyone involved.
