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Redirects will hurt your search engine rankings if not handled properly. If all you are doing is detecting a mobile device and redirecting to a mobile version of your site, then make sure to use a 301 redirect to do so and you should be fine. Make sure that you are not replicating identical content across different URLs as that will hurt you as well.
Also, if you use Webmaster Tools for the major search engines (you should), you will have the option of submitting a separate site map for your mobile site. The big engines actually have completely different spiders for mobile content, you should take advantage of that to improve your rankings on mobile devices as well.
Hope that helps.
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