I wear cycling shorts for all of my "real" rides in warm weather, and knickers or tights in cold weather, but when I commute (in warm weather) I'm a big fan of skorts. My favorite is this Shebeest skort:

http://www.teamestrogen.com/products.asp?pID=25830

But I have bike skorts from Pearl Izumi, Skirt Sports, and Sugoi as well.

The skorts allow me to ride comfortably AND feel like a normal person in class or running errands. They're pretty cute actually.