I came across this on the Emily POst site today:
http://www.etiquettedaily.com/2010/11/self-addressed-when-the-bride-asks-you-to-address-your-thank-you-note/ How do you feel about being asked to self-address your thank-you at showers? I see this more and more to the point that I think it is becoming the norm. But after reading this I may ask my MOH and the family friend that are throwing my showers to kindly not do this. I am split on this.