Here's the link but this is what it says
Car and Hotel Rewards
Continental Airlines Chase
credit and debit card members can use their miles for car rentals and hotel stays.
I was inclined to say that its not worth it, but after I finally found availability I tried a sample booking from 2/9 to 2/11 EWR and it priced out at 6990 miles a day with Budget, while Orbitz is showing it at $121 a day. However Dollar and Enterprise do have it for $69 a day.