(via Rick Barter) Samantha Blackmon at Purdue offers this reasoning behind her use of Weblogs with her students:
There are many reasons for blogs in the classroom. The one that stands out for me most as I use a blog in my summer gender and literature class is that students get the opportunity to write about the texts that we read and to see and respond to what others in the class are writing. They seem to find affirmation that they are puzzled by, frustrated with, amused by, or totally hating the same things about the texts.
She has a class blogging about Pride and Predjudice that gets to some of what she describes.