I've noticed that quite a few people reach this blog looking for information on DAWG and Scrabble algorithms - I wrote about this topic here.
What I didn't mention in that old post, and have only just re-discovered on the net, is Graham Toal's amazing archive of resources for wordgame programmers. You'll find the original Appel & Jacobson paper, source code for building DAWG of various flavours, and even full Scrabble game source code. There's also a wordgame programmer's newsgroup if you want to bounce questions or ideas off of people that have similar interests.
Now the incentive to write the game again myself is a little less compelling! :)