Free Technology for Teachers: Minigroup - Create Private Groups for Blogging and Sharing Files
Minigroup is a free service for creating private groups in which you can share files, calendars, and announcements. Within your Minigroup account you can create multiple private groups so that you can have a group for sharing with friends, a group for sharing with colleagues, and a group for sharing with students. In each of your Minigroup groups you can post and invite people to events, post reminders, and share files. Minigroup postings are hid from search engines and anyone who is not invited into your group.