There is an effect in Scarne on Card Tricks that does the same thing, leaving a message on the spectators palm. You can't write a whole word though, but you can have numbers, cards or initials left on their skin that very easily comes off, and there probably isn't as an ellaborate set up as Tagged. Don't quote me on that though as I have no idea of the workings of Tagged, but you only need two very small and common objects for the effect is Scarne's book.
Tagged does look very interesting though.