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Forum Moderators: bill
Policy is about the same. You'll still need to change the registrant info, which from memory I think can be done online, depending on who your registrar is.
co.jp's is another story though (not sure if you're including those in the .jp domain space)
If you'd like some more specific info, please give a little more detail.
If you're talking about how to find appropriate buyers, that's something I'd also love to know as I'm sitting on some "juicy" domains!