My injinji No Show Socks are performing well.  They fit well in my Vibram Five Fingers, keep me from having to wash my shoes as often (funkly smell), prevent hot spots, breath well, make it easier to slip on my shoes, wash up well, show very little over the shoe, and seem pretty durable.  I wear them walking around and during exercise (outdoor running & "boot camp" class and they are holding up well after a few months.

I'll buy more and recommend them. It would be nice if they cost less, maybe as they become more popular..