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http://macetech.com/blog/?q=node/46
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http://www.scienceprog.com/usb-bootloaders-for-avr-microcontrollers
USB Interface with USBN960x chipset (ip over usb)
http://usbn2mc.berlios.de
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http://www.xs4all.nl/~dicks/avr/usbtiny
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http://diy.elektroda.eu/programator-usbtiny-mkii-slim/?lang=en