Redirecting all subdomains to www
In order to get the cleanest and best ranking possible, always redirect your subdomains (the ones not in use) to www! I cant stress this enough. When Google comes by and sees that http://site.com and http://www.site.com are the same it thinks that this is duplicate content, which it is! I just implemented this today for my friends site A1 Imports Autoworks. Go ahead, try it. Here is the rewrite for Apache:
RewriteCond %{HTTP_HOST} ^a1importsautoworks\.com(.*) [NC]
RewriteRule ^(.*) http://www.a1importsautoworks.com/$1 [L,R=301]
