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If you work with special education students who are deaf and you need to learn sign language, you may want to get an iPod Touch or an iPhone, because there is a great application to learn sign language:
iSign. You can use it to learn the language or you can use it as a phrase book to communicate sporadically with deaf students. The phrase book is animated and comes with close to 300 words. It is well worth the price of $3.99 on the App Store.