Keep in mind that due to TiVo I don't watch commercials like before, but I haven't seen as many offers for 0% financing as before, like the months following 9/11.
Also, interest rates have risen since then so that could possibly be another reason why I haven't seen as many 0% financing offers.
One thing I did remember seeing recently was that Dodge (IIRC?) was offering a Lifetime Warranty. The first thought in my head was how sad. Even the Koreans at their worst didn't have to go that far to win customers.
Anyway, I went on GM's website and here are there current offers in your state of Lousiana. Looks like 0% is only for 2006 models, while 2007 Cobalt has an APR of 4.9%
Current Offers from GM - GM Vehicle Showroom