I find it hard to believe that anybody who has an iPhone, and works with documents, hasn't purchased GoodReader. It's on the top-3 of applications for people w

I find it hard to believe that anybody who has an iPhone, and works with documents, hasn't purchased GoodReader. It's on the top-3 of applications for people who work with documents, and the top-10 of iPhone apps in general. But, I'll accept your premise - for the casual user of Dropbox, who doesn't ever want to buy apps for their iPhone (unusual, the vast majority of the value of an iPhone comes from it's ecosystem, but i'll run with it) - they can access their files through the iOS client. But, really, everyone who does this seriously should have Goodreader on their iPhone.