The first set of three balls are aligned so they're pointing at 2-1/2 diamonds on the far rail (see the chalk in the picture). The vertex of the rack is aligned with this as well.

The second set of three balls are aligned straight out from the side pocket. Again, the vertext of this rack is aligned with the balls.

I place the cue ball just behind the head string, 1 diamond out from the long rail. I aim for the center of the back edge of the first rack. This is important because if you hit it off center, the rack will want to twist and you'll probably miss a ball. Follow is what gets the cue ball to come off the second rack and down to the corner pocket, so be sure to stroke it pretty good. Too hard though, and the cue ball has a tendency of jumping a lot.