Getting users 
kevinholesh: Direct mail. I'm not talking the crappy postcards or the fake credit cards everyone gets.I'm talking about handwriting a note to someone influential. If your market is teachers, write to the department heads at a local High school. If they like it, they'll spread it to their teacher friends.Handwriting the notes is a PAIN (it will literally hurt your hands), but it is much more effective and personal than a cookie cutter email or a mass mailing letter.Unfortunately, this method isn't scalable, but it will give you a good start.