Sounds like how I survived the boredom of my undergraduate classes :) I spent a lot of time tracking down footnoted sources to see where the authors I was reading were getting their information from. Anyway, what classes are you taking this semester--anything interesting?
Doomsday Book is about a historian who travels back through time to the Middle Ages - 1300s - to conduct research on what life was like then. Also there's a subplot set in the future, with her support team dealing with problems there. Unlike a lot of time travel books, it's not really about the travel, it's about the period where she is. The characters are so real, it feels like you've been there.
That sounds like it could be fun :) Does this book have anything to do with that movie that came out recently about a team of archaeologists/historians travelling back to the Middle Ages?--I forget the title, but I think it was out as recently as the end of last year.