CLK Rebellion released a beta of the open-source Party Buffalo Drive Explorer that will allow you to access Xbox360 formatted drives/usb-sticks/bins:
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This app is pretty self explanatory -- created by me from ground-up, and has been in development for a while now. To use, connect your drive (if using a drive), press File>Open>Open Drive Selector>Select your drive. If you're not using a drive, load your file by going to File>Open>Open Dump.
Features so far...
* Backing up of drive
* Extracting files
* Reading files
* Reading backups/files that are a single FATX partition (such as the xlaunch.fdf file found in devkats)
* USB support added 1/13/2010
Update:
* undeletion mode
* a few bug fixes
* manual partition mode