Arlington's recessed two-gang TV BOX™ for old work or new work allows you to mount LCD and plasma TVs, and other system components flush against the wall.
This two-gang box is a combo box with half 110V for power and half low voltage for Class 2 wiring of satellite or cable TV, speakers, surround-sound, etc.
Mounting "wings" tighten against the wall board or screwed directly to the stud to hold the box firmly in place. There's no wobble. Plugs stay inside - don't protrude past the wall!