Haven't filed your taxes yet? Maybe it's a good thing you waited, because this weekend only TurboTax is offering Android users a free Basic or Deluxe return through their Android app, including the Kindle Fire version on the Amazon Appstore. This includes a federal and state return (savings of $87 for Deluxe, $107 for Premier, $127 for Home and Business).
The catch? You have to start your return (from scratch, if you've already begun in the online or desktop versions) between now and April 1st, and use the Android app to do the whole thing (you can't start in the Android app then finish online). And you need to have a compatible, Android 3.0+ tablet (or Kindle Fire) to use the app in the first place.
The TurboTax for Android App is available on the Play Store and the Amazon Appstore (for the Kindle Fire edition - which is free today, as well).