A simple conversion of Scrabble, with cards instead of tiles. Keep 7 cards in your hand, then put the cards down forming words and disposing them in a crosswords style. Double and triple scoring is given by 10 special cards.
Some later editions contain additional special bonus cards.
The Tinderbox Games edition from 2009 includes rules to 3 different games. Because of this, it has its own entry: Scrabble Cards