Wordipelago is off to an interesting start. The following is a PHP generated image of the game board, after a week+ or so:

Each gray pixel is a scrabble tile

I wonder if it will start to look like fractal geometry, or just some random blob.
The game is now accessible through
http://wordipelago.com/ with an account like any other PBBG, as well as the original Facebook interface. I'm not spending huge amounts of time on this, but it is interesting to see the game expand. It seems (predictably?) to be attracting players of the puzzle or sim game variety.