I just got word that a new app is now available for the Kindle. It's Scrabble, and it's made by Electronic Arts. They're selling it for $4.99, which is more than I'm interested in paying. Here's the description:
With SCRABBLE for Kindle play the game you know and love - anytime, anywhere.
Simple controls make it easy to play any way you want, whether you're a casual or experienced SCRABBLE player. Pass N' Play with a friend, challenge the Kindle, or play a solo game. If you need help, use the Best Word feature to create the highest scoring word possible. You can even pause the game anytime and pick it up later.
Follow your progress game by game with instant statistics tracking. As your game-play and strategy improves, you'll find more ways to rack up double and triple word scores.
This is the third app in the Kindle Store; the first 2 were made by Amazon and released about 2 months ago.