Mark Rasch of SecurityFocus has written an article with his view on the automated scanning of emails being an invasion of privacy - giving GMail's ability to display "relevant" adverts based on the contents of emails you are reading.
Here is that article
This poll is purely about the scanning of GMail with a view to displaying adverts for "interested" parties, not email in general and no "thin end of the wedge" allowing the government(s) to enforce their own keywords & actions.