It looks like you are a publisher of Adsense and Google likes you... http://www.shawnhogan.com/2006/11/google-christmas-present.html "Shawn had one in 2006" ~ Mike
I guess Google has to suck up to all their good AdSense accounts to prevent losing them to any new advertising network. It also helps promote the Google brand since these people are among some of the most likely to show off such brand-whoring goods. They did a similar thing a while back when they sent top AdWords spenders a Google mini-fridge. I think they had to spend $1,000,000 annually to qualify.