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The only consequence is that a 301 will pass most but not all of the link juice through to the new page. It is quite common after site redesigns etc to have lots of 301's in place. You may want to check out the Web Site Migration Guide blog post, it is extremely comprehensive and certainly worth a read before you embark on the transfer process. http://www.seomoz.org/blog/web-site-migration-guide-tips-for-seos