App Name: Dropbox

Description: Dropbox is a free service that allows you to share your photos, documents, and videos between your computers, Android smartphone, and with friends and coworkers. Dropbox is available for multiple platforms and is very easy to learn and implement. You start out with a free account of 2GB but can earn more free space by getting others to sign up.

Cost: Free / Paid Options

Developer: Dropbox

Reviews:

Detailed Preview/Review Of The Official Android Dropbox Client Beta – Android Police (updated July 2011)

Dropbox – AndroidTapp

Dropbox Android App Review – MakeTechEasier

Dropbox Review – PCWorld

Android file syncer face-off: Dropbox vs. SugarSync – CNET

Dropbox for Android Review (video) – Top 10 Android Apps