I would say so long as it says in small text on the bottom: such and such plugin brought to you by yoursite and you add the option for individuals to add a rel=nofollow (most people will forget) then it's perfectly legitimate link juice. But make sure to have something about the plugin on the page itself, otherwise you could be penalized for lack of relevency...
Best posts made by seoczar
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RE: Is building a WordPress plugin a bad link-building strategy now?