Engineer is correct, to a degree. If you used TurboTax Online last year, using it again this year will automatically import last years AGI and personal information, saving you quite a bit of time and effort. If you used the software version last year and still have your .tax file, TurboTax Online will also import that file directly into the online version, saving you time and effort once again.
The software will only import the previous year software .tax file.
Honestly, I find the Online to be the easiest to use - and you can use it for free. You only have to pay at the end when you choose how to file, so just go to
http://www.turbotax.com, click on Deluxe or Premier (the prices were recently reduced) and give it a whirl. At the end it's not like you've paid for anything, so if it was a satisfying experience for you, just pay and move on.
If not, use something else. You don't have anything to lose from trying something for free.