Is there a website that tracks Bitcoin taxes paid to local government?
I think it would be fantastic if my tax jurisdiction were to accept payment in bitcoins.  Every additional way bitcoins can be used adds to bitcoin's value -- it accelerates the network effect.

When they do begin accepting bitcoins, each jurisdiction could be asked to supply the totals (via FOIA request, at a minimum).  Some organization or individual could then take that data and compile a report.

But expect this to occur long, long after bitcoin is "legitimized", as you describe it, and not before.