Is it fine for the first page to be the signup page?

In the first page of evernote two text boxes are shown, one for email and the other one for password. And I almost always get these mistaken for the login form! I enter my credentials and then realize that I should have gone to the login page first! So to me, it seems very wrong for the first page to be the signup page. Why have they designed their first page like this? What's the philosophy behind that?