For preamp signal cables, PLEASE don't buy 10-foot cables just for signal routing in the back of your rack. It's wasteful clumsy takes up space and offers more chances for signal interference.
I routed two lines inside my rack by buying one 20-ft Planet Waves cable and buying two 90-degree right angle jacks. I chopped the cable for two short lengths of exactly the length I need plus 3 inches, and everything is peachy keen. Haven't had one single problem since. Totally awesome.
However... no matter how much you dump into your cables, they're useless if you run into a problem on stage and have a rat's nest of spaghetti back there that confuses you. So, allow me to impart some techniques my brother used in his racks.
First of all... COLOR CODING. Dead simple. Go buy a multipak of colored electrical tape. Use one color for each cable route. For example, from your wireless reciever to your preamp, wrap that cable's plugs with, say, yellow. Then cut two squares of yellow tape, and put those squares on the reciever's output jack and on your preamp's input jack. From your preamp to your tuner, same thing with, say, blue. From your preamp to your compressor, red. From compressor to power amp, white.
BUT ALWAYS USE GREEN FOR SPEAKER CABLES. Green has been a universal color for identifying speaker-load cables. When I still used 1/4" speaker cables, I wrapped them with green tape. Now, Speakon is self-evident, so I don't need to wrap it.
If you run a stereo rig, make sure you know which is left and right. Always wrap your right signal/speaker cables with red. Red=Right.
Now, for keeping your rig clean. Go to Home Depot, and get some plastic strip ties, some colored Velcro cable ties, and those sticky-pad strip tie anchors:
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You get a package of these, and use them anywhere your cables would bounce around or hang in the way.
The best technique, is to run your cables sideways from your jacks, to the sides of the rack, down to the next component, then over to the next jack. Create C-shaped runs. If you want, you can do it all with velcro ties instead of plastic strip ties so you can undo it without needing wire cutters to cut the plastic ties. It kinda depends on your rack, and how permanently you wanna fix your wiring.
Remember, don't fix down your cables so snug that you can't pull the jack in case of an emergency. And don't put any side-load on your jacks and plugs because you tightened the cables up.
Also, a dark rack sucks when stage lights are off. Power Conditioners with rack lights only work when the power is plugged in. And flashlights take a hand to hold. So get some tap lights. Sylvania sells Dot-It tap lights. Sticky tape lets you stick it to the roof of your rack, and will light everything up. Batteries, so it'll work even in the trunk of your car.
Planet Waves cables and extra plugs, velcro cable wraps, plastic strip ties and sticky anchors, tap lights, and wise planning of your cable routing.
He can get his hands inside his whole rack and nothing hangs loosely or tangled up:
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EDIT: Oh, and excessively long power cables SUCK. The only long one you should have is for plugging everything into the wall at the gig. I even replaced mine in my power conditioner with a cable twice as long as what came with it. But all the other power cables running to the conditioner can be done with 1-foot power cables. So go buy some replacement power outlet plugs like the big orange one in this photo. They're compact, and they fit right next to each other on a power conditioner or regular power strip. Don't worry, you can chop your power cables and shorten them just fine, it won't affect performance. Almost all gear these days use standard computer-style removable power cables, and those are abundant like cardboard boxes. If you sell your gear, just get another one, they're all the same. And for those devices that have permanently affixed power cables, just corkscrew them tightly and hit it with strip ties.