MSP430 USB Developers Package 3.0.0.0 is now available from
http://focus.ti.com/docs/toolsw/folders/print/msp430usbdevpack.html
This release adds support for the Mass Storage device class (MSC). Several new examples for MSC have been added. Please see updated Programmers Guide for details. The structure of the USB Stack has changed considerably. Please see the release notes for porting instructions.