CAT guru published two new videos, about setting up and using machine translation (Google Translate, Microsoft Translator) in OmegaT. There are separate videos for the Mac and the Windows versions of OmegaT, since they store their settings in different places.
http://youtu.be/Nuu34LdEeIM?hd=1
http://youtu.be/wjOIlJaKR3c?hd=1