books

i've got holidays for the next couple months and i've got no social life or off-line friends to speak of.
what are some good text books i can read during this time?
any subject is fine really, as long as it's somehow related to computers.
and by 'good' i mean detailed and thorough, not fun to read.

http://ocw.mit.edu
Pick an interesting course. Look at the syllabus. Download the video lectures. Pretend you're a student in that class. Do the exercises. See if you're MIT-caliber.