Selby Acoustics - Plasma/LCD tv wall mount $49.95 delivered
Can put a lock on the mount making it virtually impossible for the tv to come loose accidentally (or be stolen intentionally). Basically, very happy with this - solid, easy to install, and just bought another for the new tv. They have a bricks & mortar store - plus also sell stuff on eBay. If you're willing to wait, you can generally buy things cheaper on eBay - at the moment this mount is $49.95 *including shipping*. Insurance is an optional extra $2.35.