i just dug up a little program that i use to change links in dozens of files at once. it has saved me a _ton_ of work, i just started using it. i wish i would have found it sooner.
the program is called "advanced find and replace". you can do all kinds of crazy stuff with it, including batching which you can give it multiple search items with their own respective replacements. it's awesome.
i found it on zdnet, but the site is
http://www.abacre.com/
there's a 30-day trial, but i've found it's indispensable. awesome program.