Bring twenty-cent pieces. LOTS OF THEM. The dryers (at least the ones at Duval, can't speak for other colleges) run at 20c per five minutes and during winter you're going to be needing them because even on the occasional sunny day, your clothes will not dry if on a clothesline. As ballerinabarbie said, an airer is useful, but it does take up a fair bit of room. Speaking from experience as fresher rooms are genrally smaller than others (mine was the smallest inhabited one in college ...), you're probably going to want some space.
Also on that issue, there's another trick you can do with your wardrobe. The doors usually have hooks on the inside, so grab a length of dowel and drill a hole through each end. Loop a piece of string through each one and tie them in a tight knot (I recommend a reef knot, if you know it) and hang it from each hook and you've just made yourself an impromptu clothes line for your room (useful if you can't get to the driers). Also useful during warmer times if you're short on change and don't want your boxer shorts on view for the world to see.
