I've got it linked in my blog roll, but if you haven't checked it out already, you really should look at the The Mall Hall of Fame.
As the "curator" describes it, "One of many classic mall and retro retail internet sites, the MALL HALL OF FAME is a 'Mid-mod' mall museum, covering shopping centers of America's mid-20th century (1950-1979). There are short articles, a few photos, and at least one physical layout drawing for every mall inducted. Please feel free to post any additional info you may be aware of."
There are now more than 200 malls featured on the site. For each mall there is a ton of great information--photos, site plans and history of the property. It's a labor of love. And it's extremely well done.