Wordscraper and Lexulous are the successors to the popular "Scrabulous" online Scrabble application (they are now different from Scrabble in that they have an 8-tile rack and different board). Still fun to play...

I'm running a tournament using these apps that you might like to play in. If so, go to:

http://www.facebook.com/group.php?gid=24006165517

and click Join this Group. Once you're approved (it's a private group to keep out spammers), sign up. It starts Friday, May 8th. It is not "real-time" and you'll have a week to play each round.

There will be a 0-1600 rating bracket (great for people new to the applications, or to tournaments), and an Unlimited bracket where you can play some of the top players worldwide. It's all free, but you do have to sign up for Facebook.