There is a new official Scrabble application available in Facebook at http://apps.facebook.com/livescrabble . This is obviously there to replace Scrabulous, which currently looks like it will lose its court case. The new application is very well-featured, with the possibility of playing live timed games, word check, letters remaining. Unfortunately at present it is only available outside the US and Canada because of copyright issues. There are still one or two glitches as it is in Beta, but it is still fun to play. In the game above I am just about to put down my bingo!
Tips for playing Scrabble using the SOWPODS English and American dictionaries