Thumb Keyboard had keys you can add text to. I have my main email address set up to one of those keys.
Smart Keyboard Pro has auto text. You can set up shortcuts, such as typing GML and have it replace that with @gmail.com.
I use KeePassDroid for user names and passwords. It works with apps and web browsers. Selecting an entry adds two icons in the notification bar to copy/paste user name and password. It will also generate passwords for added security, and pretty much works with any keyboard.
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