The HTC ExtUSB Breakout Mini v1.0 brings all 11 pins from the ExtUSB connector and makes it easy to solder wires to. Includes HTC ExtUSB Breakout Mini v1.0 Board and ExtUSB Style 1 connector.

Through holes are in the order below:

6   9   11  5
O   O   O   O
7   8   10  4
O   O   O   O
1   2   3
O   O   O

1: USB VCC +5v
2: USB Data -
3: USB Data +
4: N / C
5: USB GND
6: Left Audio +
7: Labeled "AG"
8: Audio - (GND) Labeled "CK"
9: Switch (Talk) Labeled "OT"
10: Right Audio +
11: Mic +
12: Chassis Ground (GND)

Reverse engineering the connector pinout is a work in progress.
To enable Audio output short pins 7 & 8 together.

Fits the following phones and possibly more:

Tilt / Cingular 8525 / HTC Dream / T-Mobile G1
T-Mobile Dash / Verizon XV6900
T-Mobile Dash II
Orange SPV M3100
HTC TyTN
Vodafone v1605
HTC Oxygen
HTC Meteor
HTC Hermes
Alltel PPC-6800
Touch
Touch Diamond
Touch Pro / AT&T Fuze
TyTN II
P4351
S620
Apache
S411
Wizard 110
Titan
Touch Diamond
Touch Cruise
Touch Dual / Sprint Touch
Mogul
T-Mobile Shadow
T-Mobile Wing
XV6800
SMT5800