In reviewing the Project 1 assignments, a few other tools surfaced that can be used for coordinating small teams:
Unfuddle: http://unfuddle.com/
Fogbugz: http://www.fogcreek.com/FogBugz/
Jude Allred has informed me that Fogbugz is free for student projects. Simply create an account and then send them an e-mail indicating that your account is being used to manage a project for this class.