Moodle is an open source CMS (Course Management System), often called VLE (Virtual Learning Environment), that has a journal module incorporated. There has been discussion about converting this into a weblog.
It seems that the module would give the appearance of a weblog and would work in the same way, but only be available for use by those enrolled on the course.
There is also the option of keeping the journal private, so it can be used only as a means of correspondence between teacher and student.
I am exploring this for the next academic year, when I will be running an online version of one of my courses, and I'd like to use a VLE with weblog funcionality. Moodle looks like an interesting place to start. Does anyone out there have any experience of this / tips / alternative suggestions? I'd love to hear your comments.