I went ahead and used the "xmbbxm03" to get the SkiFi2 w/Car Kit for Free + Free Shipping. The paragraph in whole states that you are an employee of the retailer (not XM) OR authorized to use the the code. The code above "xmbbxm03" is for Best Buy employees. There is a similar code that does the same thing "xmccxm03" that is for Circuit City employees. I was never told I was not authorized to use the code so I assume that I am ;-) Plus, around the holidays there is no way they are going to be able to verify with any acuracy with the huge influx of holiday help.
I'll let you know what happens!
UPDATE: It worked!!! I got my FREE SkyFi2 radio in the mail today. Easy set up. Thanks albrandwood!!!