For us booktworms out there, they are worth their weight. When I started my section hike from HF-> NYC last summer, I started out with 10 pounds of books! I lost a lot of that weight in the first week, but I still held on to a few. I copy of Shakespeare's Sonnets and a short collection of Keats poetry.
This coming march I am gonna bring the Sonnets again. I also have to read Don Quixote over the summer for school. The only copy I have weighs about 2 lbs!