I learned about TKW from the blog post (2) above, how not to launch, and really liked the idea of an internet vending machine. I tried TKW and I have to say it really is a great vending machine. Put your money in, make your selection, and gratification happens (but not instantly). I found my anticipation of the postcard delivery even greater than the recipient's (which went from dread to enjoyment over three weeks). A win-win for both. Thanks for a great idea executed really well.