This is true. One of the things which happens when you drive your car, is it allows your car to completely warm up, which evaporates any water which may be in the oil. Small amounts of water in the oil can contribute to corrosion in your crank case and everything contained there-in. Changing your oil will help with this. Driving your vehicle on a 10-20 mile jaunt once a week will alleviate this problem. Driving it this way will also ensure all of your seals are properly lubed as well. Without it, they can dry up and might start leaking. There are some other factors to consider as well, such as having your gas go bad for sitting too long. Gas has the tendency to collect water over time and go bad (without treatment, usually is only good for 1-2 months maximum). To avoid this, just don't leave much gas in the tank, and make the trip to the gas station on a weekly/bi-weekly basis to ensure fresh gas is in your tank (or use a gas stabilizer such as Stabil). Running with less gas in the tank will also help with fuel mileage, as you will be carrying less weight in the vehicle (NOTE - I know someone is going to say something, so will mention: If you are storing a vehicle for a long period of time, it is better to actually COMPLETELY fill the tank along with fuel stabilizer or drain it completely so as to avoid fuel spoilage). Hope this helps.
EDIT: Also, consider riding a bike or walking ... If under a mile, it'd be good for you :P
EDIT2: Was reminded, you should follow your manufacturer's guidelines on oil changes which states for mileage AND for time.