Tape measure: I know this isn’t a power tool, but it is the one tool that you should always have with you. It is a pet peeve of mine – if you are planning on building something, or you are actually building it, have a tape measure with you. If you are in the shop, on the job site, or even at Home Depot make sure you have a tape measure with you or at least one very handy (Home Depot probably isn’t the best example, since they have them widely available, but you get the point). Without a tape measure, not much beyond rough work can get done.
Line ’em up — Most other woodshop machines work harmoniously when lined up along the walls, where they are easy to power and connect to dust collection. The amount of space left between these tools depends on the amount of room you have, the size of the stock you work with, and whether or not adjacent tools have tables at the same height. You can always pull a machine away from the wall if additional space is needed. Clearly, these options are not the only possibilities and are contingent upon the mix of machines you have, the shape and size of your shop, and the kind of work you do. The bottom line is if the layout works for you, then that’s the best for your shop (and don’t let anyone tell you any different!).
As the comic George Carlin might say, a shop is mostly just “a place to put your stuff.” The physical aspect of a shop is indeed simply a space of some kind — a garage, a barn, a teepee — that keeps the rain, rust, and robbers away and houses a collection of implements needed to saw, plane, slice, sand, and pound raw wood into useful objects. But just like the difference between a house and a home, what transforms a building full of tools into a comfortable workshop goes beyond the mere physical aspect.