A Targus CTM500 laptop bag (not far off the ultimate laptop bag):
It has two main compartments for storage but per the Targus website also has:
Adjustable Padded Shoulder Strap for easy carrying
Multiple Pockets for Improved Organization
Spacious Expanding File Section with a practical Zip-Down Workstation and Printer/Accessory Compartment
Shock-Absorbing Rubber Feet and Self-Correcting Nylon Zippers