The Mazda3 got a full makeover for the 2010 model year, and those new, improved cars are just getting into dealerships now. That's good news in two ways.
First, it means you can get a great deal on a 2009 Mazda3. Ultimately, the resale value on your 2009 Mazda3 will be lower because it's an older design, but it's not like there's anything terribly wrong with the car itself. It's fuel-efficient and fun-to-drive.
The new 2010 version, shown here, is sharper looking, more powerful and has a longer list of available features than the current version. So take your pick.