Currently this is the unmodified source code for vusbtiny, a AVR ISP programmer based on the V-USB library targeting the ATtiny45/85. The code came directly from:
http://www.simpleavr.com/avr/vusbtiny
It can also be found here:
http://www.instructables.com/id/VUSBTiny-AVR-SPI-Programmer/
Per the original author's request, this source code is made available under the GPL v2. See license.txt for more details.