I've been backpacking since I was kid, and was always taught that that your socks are the one of the most important things in your pack. I'm a firm believer silk/nylon liner sock under a padded "hiking" sock combo, and this combination has served me well. I have never gotten a blister in hundreds of miles. Obviously a good fitting shoe is as much responsible for that as the socks, but I've read quite a few blogs and articles recently talking about some people doing thousand milers with a single sock of merino wool or similar fabric.
I haven't bother to give that a shot but recently picked up a few pairs of socks that came recommended from several of those articles and blogs. The Wooleator, the Darn Touch Light Hiker, and a couple others. I'm going to try them out on a some short 25 milers without liner socks. But, I am curious how many of you only wear a single pair on your longest hikes. What other socks have you tried and had success with?