Workshare Mobile is like Dropbox and Track Changes on iOS Steroids

"These features -- Dropbox-like ease, enterprise security, document comparison -- play heavily in the company's first mobile initiative. … The result is a solution that not only meets security enterprise needs, but also delivers functionality than Dropbox while still feeling familiar to Dropbox users."

http://www.citeworld.com/mobile/21378/workshare-mobile-dropbox-and-track-changes-ios-steroids