It's great to see LIS students talking about blogs. I stumbled across an interesting article written by Blythe Summers, a first-year LIS student at the U. of Washington:
Dear Diary and Then Some:
Blogs as the New Form of Self-Expression

Sure, I'm linking to it because she mentions me, but I also want to direct your attention to a much longer paper entitled Planet Blog (Word doc) written by Betha Gutsche, another LIS student at UW. Both writings are worth a look.