Matt put this picture of the next round of Piezo Preamp boards up on his Flickr Stream. I've removed the piezo -ve input, and tied it to ground, which might loose 3dB of gain, but makes figuring out ground planes a lot easier. I couldn't hear the difference when I shorted piezo -ve to ground, and it makes the layout much smaller and easier.

Got the first set of boards from Matt Venn for prototyping piezo preamps, and they're great! I've soldered both boards, after using the JFET matching described here (NOTE: link seems to be dead - I'll copy the circuit diagram from my notebook).