I wasn't sure which person I should send this too, so I'll just put it here.
Replace /forums/viewtopic.php with this:
http://pastebin.ca/311684
It will automaticly redirect anyone who clicks a link to a thread on the old forum, to the thread on the new forum.
EDIT: Put it up on pastebin since ipb wants to make it a URL, even when it's in a codebox...
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