As if you haven't heard it enough, we're a paperless office. Ideally, each component of your application will be submitted electronically, including your school forms, transcripts, and recommendations.
The Common App has put together a quick video that walks you through the process of requesting information from your counselors and teachers. It also explains how you can request a recommendation from a teacher for a specific school.
Please encourage your schools to move to electronic submission! If we all get on board with this, we'll save time and resources (paper, toner, transportation costs associated with mail). Online submission is easy and it is far more "trackable" than the mail is.