This message is in response to Katie's question about PECS. I just thought I'd type it out here instead of as a comment so I could get some working links to follow.
PECS stands for Picture Exchange Communication System. It is used a lot when working with nonverbal autistic children, but it can be helpful and successful with any nonverbal child. Here is a site that will give you a brief idea of how the system works.
Here is a video of how one mom is teaching her son to use the PECS system. In this clip they are working on vocabulary, so in the future he knows how to ask for what he wants using pictures. There are a lot of other Youtube videos out there, too. You can make them as simple or complex as you want and as cheap or expensive as you want. There are devices out now that will actually speak for a child now, too. It is really cool (and expensive). It is like an electronic PECS book that the child carries on a strap, and when they select their pictures to make sentences, the device speaks the words. One of Mason's little buddies uses it--they are really awesome.
If you are interested at all in PECS, there is tons of information on the internet, training books, and PECS resources you can buy just by doing a google search. I can even show you a real simple form of PECS they use in Mason's classroom. I'm sure there are other moms lurking around here that have some useful knowledge too. Good luck!