Did you know that they even have their own merchandise shop? Just noticed it in the official Google Blog.
Before you get too excited and dump your whole life into your 1GB Gmail account, maybe you want to read this little analysis first.
Right now all search engines are building massive databases of your web surfing habits, shopping interests, etc. Whenever you clear your cookies, they lose track. But what if you sign in to your email account, with the tracking cookie still active, because it comes from the same domain? There's something to think about...