Hey, I wear those Injinji socks for long runs. I have the black and sand, and have just bought a pair of the new pink ones. They are great for preventing blisters. They have somewhat of a reputation of wearing more quickly than normal, so I "horde" them and only wear them on my serious runs- like marathon or longer. They feel weird when you first put them on, but you forget about them after a little while. Tons of ultrarunners wear them.

Nanci