Quickoffice Pro for Android on sale at the moment in the Google Play store (as is the case for iPhone too I believe) Normal version for phones 0.99 (normally around 14.99); HD version for tablets (normally round 19.99).
Link directs to the phone version.
Quickoffice Pro allows you to view/edit MS Office files on your phone. I've found it to be a good app, but reviews have gone downhill recently.
Useful if your Android device doesn't come with a Word/Excel, etc. editing app packaged.
It's $5.49 for the iPad version