One of our fellow bloggers, Erica Sadun, sent me an iPhone/iPod touch application that she created to manage files. iPocket is sort of like a Finder for your iPhone. It allows you to peer into the file structure on your iPhone. Specifically, I was looking to retrieve one of my voicemail.amr files for saving.
This application allows you to browse files locally, through FTP and a web interface. You can also send files via Bonjour (using a specially made Mac app) and through email. This is really handy if you want to browse the file structure of an application, or if you need to grab a file. Currently you can view images, sounds, movies, PDF files, text, and property files in iPocket. You will not, however, have access to your iTunes media library on the iPhone as Apple doesn't allow you to view this data.
Although this was submitted before the App Store deadline, it remains in review with an uncertain shelf date. You can also check out the gallery of screenshots from the application.