Back in August, you may have read my article regarding the AVR based Attiny2313/ Attiny84/ Attiny85 USB Volume Controls.
The article appears to be pretty popular on various websites, including a nice mention on the Adafruit Blog.
With the release of the Adafruit Trinket (Attiny85 based) a tutorial is now available on the great Adafruit Learning System for a Trinket USB volume control example.
After Purchasing a Trinket to experiment with and Adafruit having a great mentality for Open Source Hardware, I decided to modify my own Attiny85 volume control PCB to make it compatible with the Trinkets 5Volt firmware (flash_me_hv_5volt.hex)! (which is Arduino compatible) This gives access to direct programming without the need for a separate programmer from the Arduino IDE. Its also nice to support the hard work done at Adafruit by purchasing one of their Trinkets.