AnyAttach is a tweak that enables you to attach arbitrary files to your emails right from inside MobileMail. It comes with a file and photo/video picker that is accessible via the paper clip button that will be added to the subject bar in the mail compose window.
mail.app
Posted inHOWTO
Pull To Refresh for Mail: Add Pull-To-Refresh Feature To The Default Mail App
This tweak allows the default mail app to have the pull to refresh feature, just like most of the twitter apps out there.