Filming takes place in Los Angeles this season at Sunset Bronson Studios on Sunset Boulevard. You can order tickets via CBS at this link, or head straight to On Camera Audiences. Filming dates are scheduled through January 2011, but ticketing is limited to about a month ahead - if you want to order tickets for dates a little farther away, keep checking the On Camera Audiences page as they add new ones frequently.
Good luck, and let us know if you're planning to be in the audience!
Photo courtesy CBS