Double At is a tweak that will help you automatically type in your email address at different logins. You go into the settings and type in a word, email, password, anything you really want. Then you can go to any website(for this I used Tumblr) and double tap the "@" symbol to automatically type in your email address. Really simple tweak but also very useful for those who use the same email, have a long email, or just fed up with typing it every time. Check out Double At in the Cydia Store under the Big Boss Repo.