You'll be seeing ocassional posts from me on this blog that just flat out beg all US voters to register.
If you are a US citizen living overseas, you have the right to vote. But if you don't request your ballot THIS YEAR, you will not be able to take advantage of that right. So if you have not sent in you registration or ballot request form this year, I'm asking - nay begging - you to do so urgently.
Fortunately, this is incredibly easy to do. Go to http://www.votefromabroad.org/ and go through the simple series of questions. No matter what state you vote in, no matter what the rules in that state or county, this tool is designed to populate your registation form correctly and easily. When you're done filling it in the site will produce a PDF copy of your completed application, which you just need to post directly to your registrar of voters - the site even provides that information as well.
Do it today. You'll be glad you did.