WE'VE MOVED! Democratic Convention Watch is now at http://www.DemocraticConventionWatch.com
Just found this discussion of potential convention sites over at Democratic Underground. Cities mentioned include Atlanta, New Orleans, Indianapolis, Phoenix, Denver, Minneapolis, Miami, and Las Vegas.
Personally, given my comment below about the Republicans going to Anchorage, this comment is one of the best:
You want DARK red? Have it in Alaska! And the candidate gives the acceptance speech with Denali in the background! The roll call is held under the midnight sun! The delegates can catch salmon! The nominee can fly into Fairbanks, have a "whistlestop" tour on the Alaska Railroad down to Anchorage, and then begin the campaign tour by heading down the Inside Passage on the Marine Highway.