Maybe it's just me but if I had to send a stamped self addressed envelope along with a gift, I may as well write the thank you and mail it to myself. I agree today's world is not a written world, except for text messages. As long as the recipient acknowledges the gift does it really mater what form it comes in? I will accept a thank you anyway it arrives. It's better than none at all. If I don't receive an acknowledgement of a gift they are not on my subsequent gift list however.