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One final note on using the 301 redirect during a site migration. 1. Yahoo takes a while to pick up and index all the 301 redirects. If you look at Yahoo Site Explorer to count your inbound links you will likely not see all of them for some time. Even if youíre new URLs are indexed and ranking. Donít worry, your links are still there and your probably getting credit for them. Your rankings havenít changed so itís safe to assume the search engines are still correctly attributing links to your old URLs links to your new URLs.
PS:-I'd like to add one more thing that you will loss PR of the pages, but originally they stayed there and will be fine having a next google PR update..