He finally got around to etching this ATtiny85 programming adapter. If the project is not pin hungry, an ATtiny85 can run Arduino sketches without the need to port the code.

ATtiny with USB Boot Loader: Tips & Tricks for DIYers. DIYers building a development board similar to this one, and looking for applications to be added through USB without an external programmer, ...

Features of the Arduino Learning Kit ATTiny85 and Programmer Board : – Support For the Arduino IDE 1.0+ (OSX/Win/Linux). – Power via USB or External Source – 5v or 7-35v (Automatic Selection).