Greenwillow editor Martha Mihalick, who may well be a GENIUS, recommended the use of Wordle.net to check the language of your work in progress.
Wordle builds collages out of the words in a document, so you can see which ones you use most of all.
I tried it on a novel and found a flabby word I used way too much. Then I did a find and replace search and saved myself about 200 words.
I tried it on a picture book and sent the image to a friend, who was able to tell me what my story was about simply by the big words that appeared. Here's what this blog post looks like: