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http://www.harbaum.org/till/i2c_tiny_usb/index.shtml
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http://www.scienceprog.com/usb-bootloaders-for-avr-microcontrollers
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http://vamposdecampos.googlepages.com/infrahid.html
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http://dev.emcelettronica.com/microcontrollers-usb-stick-tool
DIY Sound Card
http://www.electronics-lab.com/projects/pc/026/index.html
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http://www.dorkbotpdx.org/blog/feurig/benito_my_first_at90usb162_project
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http://www.fourwalledcubicle.com/wiki/Wikka/MyUSB
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http://www.recursion.jp/avrcdc
Documentation
http://www.usbmadesimple.co.uk
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http://www.raphnet.net/electronique/usb_game12/index_en.php