I've recently become a big fan of the socket racks from
Ernst. My brother bought me a starter set for Christmas a couple of years ago and I never really got too excited about them as it seemed the sockets would fall off the clips fairly easily. I finally decided it was time to get my tool box (somewhat) organized so I checked out the Ernst website to see what additional items they had available. I was happy to find that they had come out with a new "twist-lock" version of their clips. There are no moving parts, no levers, no springs, no ball bearings. The clip is just designed in such a way that you put the socket on them, twist 45 degrees, and they are locked in place. Here's some pics...
I use this drawer for a full selection of 1/4, 3/8, and 1/2 drive standard sockets:
This drawer handles all the deep sockets, torx, allen, screwdriver, spark plug, and other random sockets laid over on their side:
And this one holds the ratchets, breaker bars, spinners, and torque wrench:
I have them color coded Red for SAE and Blue for Metric. They also make yellow, but apparently those are only available for sale on the Mac truck. There are sticker labels included so you can completely customize them to suit your needs. I personally have not used the stickers as I never seem to have much luck when combining grease, oil, and adhesives. I don't think the labels are really that necessary anyways as I just bring the whole rack with me when I crawl under the Jeep.
I went on a wheeling trip this past weekend and quickly threw each of the rails I thought I might need into a duffel bag as I was heading out the door. After a weekend of being tossed around and burried under camping gear, there was no breakage, no lost sockets, no problems. A few of the clips moved a bit on the rails but it's easy enough to move them back into position when you put them back in your tool box.
Some things I like about these Ernst socket rails:
You can mix and match sizes on the same rail
You can have as many or as few clips as you need on each rail
The rails are available in different lengths and different colors
The clips can be pushed very close together for those small 1/4 sockets
The bases that hold the rails upright can be had in a magnetic version to keep them from sliding around
Extra clips are available (extra heavy-duty ones for impact sockets as well)
Made in the USA and carry a
lifetime guarantee 
atriot:
And surprisingly enough,
these are actually pretty cheap!
They have a bunch of other tool storage stuff as well. I have the gripper wrench organizers:
The thing I liked about these is they sell them with any number of slots from 4-15 so you can get precisely what you need without ending up with extra slots. Probably not a huge deal, but it helps out folks like me with mild OCD.
Anyways, check them out. You can tell this stuff is actually designed by people that use it. Might not be as sexy as some of the other racks out there, but they are durable, easy to use, and really well thought out. They provide you with a lot of options to customize your storage solution to suit your specific needs. Their website isn't the greatest and is a little difficult to navigate. I figured out exactly what I needed by looking through a few different websites and then called them directly. Their customer service was great and shipping was fast. Can't recall the guy's name that helped me, but I was transferred to him once it was determined I needed "technical" help.