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A Firmware-Only USB Driver for Atmel AVR Microcontrollers

A USB device without dedicated USB hardware

AVR-USB is a firmware-only implementation of a USB 1.1 compliant low-speed device for Atmel's AVR microcontrollers. It runs on any AVR microcontroller which has at least 2 kB of Flash memory, 128 bytes RAM and can be clocked at 12 MHz. No UART, timer, input capture unit or other special hardware is required (except one edge triggered interrupt).

AVR-USB can be licensed freely under an Open Source compliant license or alternatively under a commercial license.
Features

    * Fully USB 1.1 compliant low-speed device, except handling of communication errors.
    * Supports two endpoints: one control and one interrupt endpoint.
    * Transfer sizes up to 254 bytes.
    * Comes with freely usable USB identifiers (Vendor-ID and Product-ID pair).
    * Customizable sections are written in "C" and are well commented.
    * Delivered with fully functional example applications.
    * Only about 1400 to 1500 bytes code size for basic functionality.
    * You can choose the License: Open Source or commercial

http://www.obdev.at/products/avrusb/index.html
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Daniel
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wow. I wonder if that would  make a $5 Arduino possible?
the schematic is so simple...

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