I have one of those hangy row couonters super cheap here
I use it for flat and circular knitting. I *also* have a beYOOtiful row counting bracelet I made :-) A picture of the new prettier pink one is below, and there's pics of the first green/yellow one I made here
on my blog... I didn't like the wire I used for that one, so I made another until I have time to take that one apart (this one is strechy clear elastic which I like better). My blog also has ridiculously detailed instructions on how to use it :-) (hint hint look at my blog :-) )
I made 2 others for some friends, (I should have taken pictures) and they LOVED them. Very stylish, AND you don't have to worry about your kids messing with your counter, or your cats stealing them (like mine do)
**edit at 11:21pm CT... see in the top picture is my hangy counter, in the background!! And it is very useful I use it all the time. ... it's not quite as convenient for straight knitting, because it only goes on one needle, but it's GREAT for knitting in the round.
and ignore my dirty toe in the pictures!