actually you can lease a sky.
most dealers DO have deposits on a their Sky allotments for the year, but not all of those are going to be purchases. I have a few customers who are going to be leasing their Skys.
plus, as someone already said, there are still several dealerships who ordered cars themselves and have them to sell for whoever wants them. also, there are always going to be people who get cold feet when they see the total price of the car and walk away.
but, the lease rates right now are not attractive at all (at least through GMAC, but even most other banks are using pretty much standard rates).
people leasing their Skys will enjoy them for 2-3 years, and then when they are sick of them, they can just get another car. not for everybody, but for some it makes perfect sense.