Well, if you use Google Apps and your own domain, you can point the domain at the new app after copying data over. http://code.google.com/appengine/docs/domain.

Well, if you use Google Apps and your own domain, you can point the domain at the new app after copying data over. http://code.google.com/appengine/docs/domain.html http://code.google.com/appengine/docs/domain.html Being able to do a migration online and for the same appspot.com domain is something we'd like to do, but I don't have any timeline as for when that will be available.