I'm a big fan of Phil but I wanted to alert anyone who wants his autograph to beware of sending anything you value to the Scottsdale address on his website
http://philmickelson.com/. In December 2011 I sent via certified mail a 2004 Masters flag for him to sign over a year ago. They state on the website it can take up to a year to get the autograph.
Recently I mailed two followup certified letters (one regarding my change of address) and asked for a status but it did not elicit even the courtesy of a response from them. So 1.) I'm kicking myself for sending the flag in the first place and 2.) I misplaced the certified receipt signed by them that they received the flag (but hey, I figured these folks represent Phil and so they should be honest and upfront, right?). But for anyone else, this is just a warning.
Update Feb 21, 2013. I was able to get my flag back with a little help from a friend who lived in Scottsdale. She visited the offices and spoke to someone there who apologized for the delay in getting Phil's autograph. About three weeks later I received my flag.