FileAid (http://www.digidna.net/fileaid) for the iPhone and iPod
touch is being offered for free through March 17. You can find it at
the Apple App Store
FileAid is a file manager and viewer for the Apple devices. You can
copy files on your device for a quick look on the road. Copying files
over to your iPhone or iPod touch takes place wirelessly (by FTP) or
via USB using DiskAid (which is freeware).
Supported file formats are images, PDF, Microsoft Office, iWork
(though iWork ’09 isn’t supported yet), plain text, RTF, audio,
video, web archives and HTML.