I recently discovered a website called autocrit. I think it's pretty cool because you can submit some of your writing and the program will evaluate it for a number different things. I was surprised at some issues I hadn't previously considered--like overused words.
I'm not expecting this program to be a cure for all that ails my writing, but like Grammar Check on Word it can make me more aware of areas that need more attention.
Do you have any challenges with overused words? What do you do to add variety?