My mu installation using wildcard dns subdomains works great, and I'm very happy with it.
a0.example.com to z9.example.com all work perfectly
And if you go to http://www.example.com it will automatically redirect you to example.com.
While that's great that it takes you to one consisten place, is it possible to have the http://www.example.com subdomain be the default, with example.com redirecting to it?