Our sales director recently stumbled upon a lead generation company called getBiz - Although they don’t specialise in one industry or market as such, they’ve driven some good leads my way.

You can assess leads via a channel, and give a quality score to each lead you receive. If all users do this, then it begins to build a pattern / indication of the channels worth, allowing you to focus your efforts. Seems like a good idea, so we’re trying it out for a while!