Project Piece outsourcing over the net

Just by chance I noticed I was researching a couple of those coder-outsourcing sites like

and I spoke with some people that made exceptionelly nice deals there, were very happy - AFTER weeding thru a bunch of crap-heads that just could not deliver…

so the general question now is - what - except from the “community” rating on those boards can help select the right coder…

the thing portable reputation is another buzzword I heard recently… not sure if that will help… a simple number doesn’t scale well to the wide differentation in software projects…

any helps and inputs appreciated…