Seems to be old news, but I either forgot or was never aware of it. If you buy a new car this year you can deduct the sales tax from your taxes, even if you don’t itemize. There are some income restrictions, but they’re pretty high.
http://www.irs.gov/irs/article/0,,id=214016,00.html
http://www.irs.gov/newsroom/article/0,,id=205863,00.html