If you are really concerned about Google penalizing you. You would need to create a script for the default page that checks the URL entered, if it starts with a WWW then it's ok, go ahead and proceed, if not then redirect to the new site. An easy way of doing this is to use a non-standard default document and then just have a default document that does the redirection.
An easy redirection would be the following ASP code:
Code:
<% Response.Redirect("http://www.somedomain.tld") %>
A better edirection would be to write out 302 Permenantly Moved Headers.
Hope this makes sense.
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