Technically they have to say no, but they are not blocked and everybody I know uses them.
This is the official stance. Sharing Music & Videos Over the Internet
But nobody has ever received even a letter from the RIAA, much less been prosecuted at Middlebury.
From another document on the Midd website:
So you will be fine. I use P2P all the time at Midd, I like to take advantage of the T3 connection while I can.