Commuter

Thats about the length of my bike commute. Make sure you have a rain jacket and lights. A giant backpack us also helpful. Also, it is worth investigating the best way to get to campus (unless it is obvious) and coming up with a few alternate routes.

I personally love my back baskets on my bike.  Yes, they make my bike weigh 20 pounds, but I can fit my backpack in them.  that way I don't hunch over with a lot of weight on my back and I dont' come to school with sweaty strap marks on my shirt.  Also they are great for groceries.

I commute a few times a week at 20mi each way. 

• head light--leave it on so if you're running late you don't think about ditching them.
• tail light. I attach mine to my bike so I don't forget it.
• a good, big backpack.  I've heard a commuter/messenger bag is better, but haven't tried it.
• with a backpack, a more upright position than on your race bike is important.
• bulletproof tires.  I use Slime tubes and kevlar liners in the tires.  I also use tires with some tread (cyclocross tires).
• find a good route where you're not battling traffic, even if it's 15 mintues out of your way.
• Have fun!