Readdle has made Documents a universal (hybrid) app, meaning that iPhone owners can use it, too. Documents lets you read Office documents, read and annotate PDF files, edit text files, move files to and from your Mac or PC, download documents from the Interwebs, and more. It's a free download, and it's available now. For iPad owners who already had it, the new version is 4.1.
Check It Out: Readdle Brings Documents App to iPhone