I was looking at a page in the DET for different resources that can be used for different KLAs. I found this site to be very beneficial.

One really good program that i got addicted to was the visual thesauraus. You type in a word, and a mind map of all the different similar words come up. I found it very useful, and would be great benefit to students. I tried the free trial however the full program needs to be bought. But its a good investment