I am working on a project that requires some real audio and I always wanted to play with I2S (attached to an arm microcontroller). So I decided to design a breakout board with stereo audio input and output(*). It uses a Wolfson ADC WM8782 and a Wolfson DAC WM8523. All configuration pins are available on the SIL headers. The headers are at 2x10x100mil with 700mil spacing, so it should be possible to dump it into a breadboard. The breakout board can be split into a DAC and ADC part, each measuring 21.6mm by 45.1mm.
Check out the project in the forum.