Both of my jobs (although I am technically employed by a single entity, the University) are on campus, along with my classes. For classes and my biology lab job, I just lock up on the racks outside of most buildings. My main commuter bike is pretty nice and fairly valuable, but not in a mountain bike or road bike "bling" kind of way. The powdercoat is pretty tough, so nicks and scratches aren't much of a concern. The U-lock is enough to keep me from worrying about theft. The other two bikes are less valuable and have enough nicks and scratches already that more will only add character.

For my job at the local bike co-op, I just bring my bicycle into the building and bring it inside or lean it by the door in the hall (we have a single room in the student union). Actually, I'll bring my bicycle inside and just leave it there even if I have other business in the building. I might as well! It's good to be an employee.