One of GMail's handier features that people are still surprised to learn about is the ability to make multiple, unique address aliases on the fly.

If your GMail address is example@gmail.com, emails sent to example+user1@gmail.com, example+user2.gmail.com, example+admin@gmail.com will all go to the root example@gmail.com address.

It’s easy to take Drupal’s built-in user management features for granted… out of the box, you can configure your site to allow user registrations, reset forgotten passwords, and handle user logins. We had a use case where we wanted to combine the login and registration forms into a single landing page for anonymous users, to encourage users without an account to sign up with a single click rather than hiding the registration form behind another link.