Check this fileaid product too..
FileAid is free until March 17 ! Exceptionally and for a limited period of time FileAid is free. So grab your copy of FileAid and enjoy copying and viewing FileAid on your iPhone or iPod Touch completely free of charge. FileAid is a file manager and viewer for your iPhone and iPod Touch. Easily copy files on your device for a quick look on the road. Powerful and yet still very user friendly, FileAid will let you find the document you're looking for within seconds. Copying files over to your iPhone or iPod Touch takes place wirelessly (by FTP) or via USB using DiskAid (freeware).
http://www.digidna.net/fileaid/