From Sandra Betzina's Power Sewing, I read about a foolproof plaid matching system, but it involves laying out each pattern piece individually on a single layer, and I don't have anywhere in my house big enough where my kids can't reach, so that method was out, although if you do have such a space, it looks like an amazingly accurate method. Check it out.
Since I had to lay out my fabric folded (my dining room table is just wide enough for folded 60 wide fabric), I wanted to make sure that the dominant pattern (in my case the red stripe) lined up both horizontally and vertically.
Now, on to placing the pattern pieces. I found this great old sewing text at my library called "Unit Method of Clothing Construction" by the Iowa Home Ec. Association. It has this awesome diagram for pattern matching!

"Place pattern pieces on vertical lines first, placing CF, CB and Center of sleeve (marked a in the figure) on the same plaid or stripe repeat. Slide pattern pieces up or down to match corresponding notches for horizontal meeting (marked b). Be careful to match at the SEAM LINE not the cutting line. If sleeve cannot be matched at both front and back notches, matching front notch is preferable."
Happy Matching!!