The updates Documents App on the App Store does just that!
If you haven't heard of Documents before, it's the first mini office suite available on the iPhone. Since early 2009 it has been used by nearly 10 million iOS users. The reason is simple, it's just the easiest way to manage files on your iPhone and iPad wherever you are.
In upcoming v5.5 Workflow support is added so you can even open files using other Apps on your devices! and of course the recently added multiple email attachment feature is already helping many productivity users be even more productive while on the go.
Documents is only $2.99 to purchase. And there's a FREE edition if you don't want to spend anything.
Documents is a must have App for any serious iOS user.