I love Good Word. I use it to see whether a word will be accepted, especially if I want to make a word perpendicular to it e.g if void is on the board I would confirm that avoid is accepted before exploring all the words I can make that would put the a in the right spot. Or I use it after a word is accepted to see what it means (e.g. ted is spread out for drying?). My only complaint is that it sometimes says words are not accepted when they are (e.g. di fi, gi)
SoySD about Good Word - Words With Friends Word Checker and Dictionary, v2.0