The website MLB Trade Rumors.com has a complete list of rankings by the Elias Sports Bureau based on a player's combined offensive statistics. Each of those players is also labeled with a type that determines which draft picks a club will receive should they decide to sign elsewhere in free agency. Ben Goessling has a few observations, and I don't know which one is more surprising - that Adam Dunn is only rated as a Type B free agent, or that Josh Willingham is actually rated higher than him, and earns a Type A distinction.
↵↵↵But there are fewer outfielders who offer Willingham's level of production than there are first basemen who offer what Dunn brings, and because of that, Willingham is seen as being (a hair) more valuable in the Elias projections.
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No knock on Willingham, but I don't think anyone would have seen this coming. Looking past that though, it is not good that Adam Dunn is only rated as a Type B free agent. Like I mentioned above, that would mean the Nationals receive fewer draft compensation when if Dunn signs somewhere else.