Google has a great free service that was called Language Tools. It was located on the right hand side of the Google search box under the link for Advanced Search. But now Google has improved what you can do with this feature and moved it under the "more" link at the top of the Google homepage.
Now called Google Translate, Google will still help you translate text and websites and now provides you even more options. You can also use your Google Account to access the Translator Toolkit.
I've used Google Translate to translate letters I have written, comments from Spanish speaking family members posted to Facebook, and even to read foreign gravestones. This free service is a great addition to your genealogical research.