This seems to be something of a trend among the smaller big city museums.

Baltimore Museums Drop Admission Charge
Local jurisdictions step up to fund the difference and (of course) 
travelling blockbuster exhibitions will continue charge admission.
http://www.wheremostneeded.org/2006/06/baltimore_museu.html

Regards,
Dan Prives
"Where Most Needed"
Blogging about charities daily at:
http://www.wheremostneeded.org

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