I just got this black chambray Hill-Side bandanna from Context (Max's post at APO pushed me over the edge). It is awesome. I could have used this today on campus (lots of sweating today).
This is how I'll be carrying it (not planning on doing any neckerchief things with it yet, although I might on hikes). I'll be hiking tomorrow and will put it through its paces: I plan on sweating a lot.