Kris,
While yes, the monthly fee associated with making payments could be invested somewhere else, generally the price you pay in a lease is less than that of a car loan. Simply because you are paying for the value of the car at the end of a lease. In turn you could take the monthly savings and invest that - which would yield an even greater savings than making payments on a car loan.
InnovativeHost,
Yes, it is nice to have something paid off, but at the same time - as you mentioned - the resell value is almost nonexistant when you are done with your car.
Both our cars are paid off, no loans on them, titles in my name, so we've got no leasers so far?