... positions in the game of football, due in large part to the short lifespan of such a physical position, and the contributions of the offensive line often "making the back."

Of course, that hasn't stopped teams from spending big money on the position in free agency. But are any of the backs in this year's unrestricted free agent class worth opening the wallet for?

That remains to be seen, but these are my top free-agent five running backs in 2010:

(Note: This series of lists only includes unrestricted free agents, as those are the only type that can be signed without giving up compensation. Restricted free agents—especially the best ones—will cost valuable draft picks. Rel...

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