Andy Warhol Museum
Uses the default template. But they keep it up to date.
Brooklyn Museum
One of the best designed. Up to date. Lots of friends. Cohesive.
American Museum of Natural History
Looks very myspacey. Page is too wide. But, using media, relatively up to date. Interesting comments.
South Bend Museum of Regional Art
They're a musician, interesting choice. Not very recently updated. Not a lot of friends.
Walker Art Center
Us! Needs an update, design is so so.
See also:
http://chnm.gmu.edu/staff/sheila/blog/2007/01/11/gendered-museums-on-my-space/
http://zekesgallery.blogspot.com/2006/10/art-museums-on-myspace.html