Agreed it depends on when you are buying. If you are going to buy immediately you will be lucky to even get MSRP from dealers that won't budge. They will get enough business from the people willing to pay 5k over so they will not negotiate with you. If you are talking December 2010 you will get a nice discount.
Also another tidbit for you all. ALWAYS go shopping for your car on the last business day of the month. Salesmen need to make a quota and will do almost anything to move a car, especially a sports car in a winter month!
So if you can hold out and let the lunatics buy their camaros 5k over you will probably be able to get invoice +1,000 within 3 months and invoice within 6 months.