So, I've been a major spoiler whore for all three of the prequels. For the first two movies it was easy 'cause I had a lot of friends that were into spoilers.
This time around pretty much everyone I know is completely spoiler free. I have to be extra careful around my fiancee who hasn't seen the trailer, and has been pretty much on a self imposed Star Wars blackout since Episode II. All she's seen is the teaser poster and she knows the title of the movie. Every day I'm erasing my browser history, and every episode III related pic & video is in a hidden folder on my computer so nobody I know gets spoiled.