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Thanks in advance
If you have a lot of changes to make, a custom error handler script that can map from the old URL to the new URL would make your life a lot easier. Basically, you write custom 404 error handler and then return the 301 for those pages which you've moved or want to remap. If it's a truly bogus request, you return the 404 error.
See this thread: [webmasterworld.com...]
and check out the web site referenced in DreamQuick's profile - there you'll find what you need to take care of a bunch of problems.