Hi,
This design was created by Ian Fritz (google "ian fritz transistor matching" for more info) and is widely used in the synthesizer DIY community for Vbe-matching of bipolar transistors, both NPN and PNP.
The Gerbers attached were designed by someone on the MuffWiggler forums. As I missed out on his production run, I am going to order my own PCBs from his Gerber files. Please let me know ASAP if you would like a PCB or two. As I would have ordered these regardless of whether anyone else was interested, I'm happy to make them freebies.
Note that to get good use out of this you'll need a fairly good voltmeter - ideally one that is useful in at least the 10uV range
John