I would like to attach a 42" Plasma on the patio, the wall is brick. I will use a articulating mount. How should I attach the mount to the brick?
I'd use Tapcons (they are the brand name of a screw designed especially for masonry). Basically you drill the appropriately sized pilot hole and then drive the screw. They're quick, easy, and work well.
Beyond that there are any number of wedge or sleeve type anchors that would also work.
Here is a link that might be useful: Tapcon Website