Couple of comments:
Each person has an ethernet jack in the room. You may need to get a longer cable to connect to it. University Computers, the BU Bookstore, Radio Shack sell them so don't bring a long cable.
Consider getting a small bedside table when you get to school. Something large enough for an alarm clock. Also some thing to toss your change into. Otherwise, you'll end up with little piles of change in your desk, on your dresser, on the floor under the bed, etc.
Your room will more likely be hot in the winter than cold. Heavy blankets, heavy pj's may sound good now but not when the radiators are on and you've cracked the windows open. Also, your room will get dry from the heat.
As for a book bag, you'll likely want something that can hold a laptop - but . . . experience says you'll often leave your laptop in your room. It's heavy. There are almost always computers to use elsewhere. So, consider getting a padded liner you can put in a bag so you can have a lighter bag when the laptop isn't in there.
I also recommend a separate monitor and keyboard. LCD displays (17 or 19") are cheap. Much easier to use than a 13 or 14" screen.
Because this world runs on batteries, you'll probably need to plug in your cell, your ipod (or other) charger, your laptop (or desktop), your printer, etc. Odds that your room will have enough outlets: really low. Extension cords will become your friend.
Most kids now don't get local phone service. They just use their cells.