One thing there's no shortage of in the Marketplace is Scrabble-type games. Words by Post is one of those and is very similar to Alpha Jax (see AlphaJax vs Spell It!).
The difference though is Words by Post is also on the iPhone and Android and version 2.0 of the game just hit, bringing inter-play between those platforms. Yes, now you can play against your iPhone friends (if you have those) and presumably Android as well, making this one of the first Scrabble games to bring cross platform gaming to our system.
The game comes in two variates: free (ads in game) or paid ($2.99), features rankings, push notifications for turn-taking, shake to reorder tiles, chat, etc., making quite it robust. We like the sound of this and enjoy the game design so far, so it may be worth a spin.
(Thanks, Ian H., for the tip!)