Spotted in the MAKE Flickr pool:

When we last covered recotana’s Open Sound Controller (OSC) library for Arduino (ardOSC), he had an Arduino talking to an iPhone using the OSC protocol. The project worked quite well, however you had to manually connect the two together by specifying their IP address. Now, by adding an implementation of Bonjour, the Arduino can link up to the iPhone automagically, allowing one to easily get on with their mixing.