Google discloses that smart software does attempt to provide you with sidebar adverts of things you are likely interested in knowing about or linking to. However, they also state that no human presence ever personally looks at any of your private email, which always remains private. I for one feel much more comfortable with this Google position than with say Yahoo or Hotmail, or...AOL! And the ads are the same type we are used to seeing everywhere, just like the sidebar ads when you do web searches. I see nothing wrong or intrusive about that.