You can sign up Gmail and enjoy all its new features by visiting the Gmail.com homepage and clicking on the ‘create an account’ tab. Gmail also allows you to sign up other social networking sites such as Facebook, Twitter, Google, etc. with your Gmail account, provided, you sign up Gmail account. In addition, Gmail allows you to have multiple sign up for Gmail accounts and link all the accounts and switch between accounts without having to individually login and logout of accounts. You can also access all the Google accounts including Google+, Orkut, etc., once you just opt to sign up Gmail one account.