This is pretty interesting, I didn’t know this possibility. Do you have more information about this method? How many subdomains can I have? If I “unregister” a subdomain in the future, does this subdomain become avaiable to others?
I’m planning in doing a test server for some projects, so I dont want search engines around this subdomain either. Putting a robots.txt in my server is all I need to prevent google from caching mynewsubdomain.dreamhosters.com? (Putting a robots.txt prevents google from even showing results in searchs for “mynewsubdomain.dreamhosters.com”)?
PS: I found an entry in wiki: http://wiki.dreamhost.com/KB_/Sign_Up/_Signing_up_for_Service_with_DreamHost!