How anonymous are ratings/reviews in the Android Market?

I can see from reviews other people have given to apps in the market that at the very least your account name is made public. However, I was wondering: 1. Is that the only thing made public? 2. If I only give a star rating to an app (but no comment/review), is this anonymous? 3. Is there any way to leave anonymous review comments (i.e. without visibly associating your account name with it)?