I have to agree with our static-free friend here. Despite their credo of "don't be evil", the potential for future abuse of your information by Google still exists. If there is anyone to fear regarding your privacy, it's Google. They collect and analyze data. That's their business.
I do not use Gmail and I do not send email to Gmail accounts. There is no protection afforded to the individuals on both sides of the conversation and any right-to-privacy argument goes out the window after 180 days anyway.
Read about Gmail privacy here,
Gmail Privacy Page
Now, where is my tin-foil hat?