Thanks to Teresa for this link to a "weblog" client made specially for teachers.
I haven't tried it out yet, but certainly will. This is how it is described on the site:
"Classchatter.com puts powerful management tools in the hands of the teacher while protecting students' privacy and identities. Students are added into virtual "class" by a teacher or instructor where they may keep a personal blog, interact with fellow students' blogs or react to topical blogs created by the teacher."