What Makes a Great Arts District?

Here is a link to a post on the blog Rebuilding Place in the Urban Space. The blog covers general urban issues, but the blog`s author, Richard Layman resides in Capitol Hill, and has been involved in furthering the revitalization of H Street NE. In this post he writes about creating dynamic arts districts. He links to a good site that I saw a while back when he sent it out on a neighborhood listserve. The site I refer to is Penn Avenue Arts.