Dont know if this has been posted or not, but words with friends is now out for android, and yes you can play against Iphone users. Its same as Wordfeud.
Yup been playing for a week or so I guess.....fun game.
HTC THUNDERBOLT Rooted / Perfect Storm 1.2 ROM / Overclocked @ 1.80GHZ
Evolution : Droid 1 - Incredible - Droid X - Thunderbolt