I used V-USB for a couple of projects with my own code from scratch (i.e. No Arduino etc) and they work fine. I am using Win7 X64+libusb and use Vendor Specific commands only.

Start Data Logging. Now you can write data to the SD card. First, open the “Datalogger” example sketch (File > Examples > SD > Datalogger) and upload it to Arduino. This sketch reads the value from ...

It is an Arduino compatible board (hardware, not footprint) based on the ATMEGA1284P which can be programmed to collect and post data to internet logging sites such as Thingspeak or Xively.

Hotplug Support: Enjoy the convenience of detecting and managing USB mass storage devices seamlessly. Arduino_UnifiedStorage ... catering to real-life scenarios like data logging and storage backup.

The Arduino compatible Pax Instruments T400 Temperature Datalogger is now available to purchase priced at $175 from Adafruit. If you liked this you might also be interested in building an Arduino ...

Built for as little as $10, Samy Kamkar's KeySweeper secretly "sniffs, decrypts, logs and reports back (over GSM) all keystrokes from any Microsoft wireless keyboard in the vicinity." ...