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If anyone could give their opinion or a link to a past thread, that'd be great.
(I've tried searching the board for this info, but either I'm using the wrong keywords or I'm not searching the right way. :) )
If you legitimately have to give up using the domain name you could use a 301 permanent redirect from the old to the new domain. Either that, or mod_rewrite is an option and a search will bring up plenty for those.
It'll also involve getting directory listings and links changed.