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What is URL forwarding if it isn't a 301 or 302 redirect?
<link rel="canonical" href="http://new.com/path" />
tag to all pages, each one including the canonical hostname in the referenced URL.
AFAIK meta refresh and / or window.location donīt work as 301, both return OK 200, then Googlebot canīt see the redirect.
Matt Cutts: 302s are intended to be temporary. If you are only going to put something in place for a little amount of time, then 302s are perfectly appropriate to use. Typically, they wouldn't flow PageRank, but they can also be very useful. If a site is doing something for just a small amount of time, 302s can be a perfect case for that sort of situation.