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.

book on linux kernel architecture. I think there is a nice one by oriely maybe.
Teaches you nice posix concepts unless you already know them and also good for driver hacking if you ever need to do embedded stuff.