If anyone's ever tried to move domain, you'll know its a pain. One way to make things a little easier is to provide an automatic 301 redirect from your old domain to your new one - this marks the new destination as a permanent change, and will generally be picked up by search engines. This shows you how to do this redirect with IIS, passing the full path and query strings along too..
A work around that allows you to have multiple virtual servers on an XP Pro machine..