Is there a Words with Friends type game for Windows Phone 7 and Iphone?

I have Windows Phone 7 and want to play Scrabble/WWF type game against someone with an Iphone. Is there a word game compatible with both?|||There are (at this time) three scrabble type games on Windows Phone 7. Alpha Jax and Spell It for WP7. Words by Post (free) will work on WP7, iPhone and Android.