Here are a couple:
http://imopm.4t.com/index.html
http://www.toymuseum.co.uk/
http://www.patentmodel.org/default.aspx
http://www.brightontoymuseum.co.uk/
http://www.themodelcarmuseum.org/
http://www.toys-n-cars.com/
http://www.guillotine.net/museet/museet2.htm
http://www.sdmodelrailroadm.com/
http://www.bearspage.info/h/tra/ca/bc/va/mo.html
http://www.memlane.com/nonprofit/mhmma/
These run the gaumit from model railroad museums (the Choo Choo barn was ok but the San Diego one was awesome), model ship museums, model car museum (located here in Salt Lake City), some unusual models (not kit built) and one that is all kinds of different kits.
The Verlinden Museum in St. Louis has unfortunately gone out of business (lack of traffic).
Our club president holds the Guinness World Record for number of different aircraft models with currently over 1700 different kits(markings). These are located mostly in one room of his house. Would make a great start for a museum. But have to agree that unless you have financial backing.