Classroom Heroes is a new service that seems similar in concept to ClassDojo. Classroom Heroes lets you make a record of your students' behaviors in your classroom. The service also gives you a place to record homework assignments. You can share those records with your students and their parents through SMS and email. Like ClassDojo, Classroom Heroes offers avatars that can be used to represent your students in your classroom.
Classroom Heroes isn't open to the public yet, but it is accepting registrations for early users. If you're interested in being an early adopter, you can register on the site.