The only way to do it would be to have a form that the client fills in with their request, a coder accepts and posts his price and agreeing to the terms, the money gets paid by the cllient in to an account which is nothing to do with either of them, a sort of escrow, any amendments...etc are noted by and acknowledged by both parties in the same form/thread, when the job is complete/time agreed up both parties acknowledge the original request has come to it's rightful end and the coder hands over the changes from demo to live site or produce a plugin and the money gets paid out of the escrow account.

But then you do need someone willing to mediate and run this kind of thing ;)

And then this would be E-Lance right? :D

This is a nice change. Back in the day it was the good old boy system and the mods did what benefited them.

Damn you mean a little research and someone could have hired someone that way? ;)