Do everything that you possibly can NOT to change your permalink. If you must change your permalink make sure that you do a 301 redirect. Follow these instructions.
Show Notes: http://wp.me/p4XE5x-27r
Pretty link example:
Original link: http://iteachblogging.com/welcome-5-favorite-google-chrome-extensions/
Pretty link: http://iteachblogging.com/chrome
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