Most new Modtronix Single Board Computers have a 6 pin female Micro Match connector with I2C, SPI, 5V and GND pins on them. The Micro Match connector is manufactured by AMP, and is a very small, polarized and cheap connector! This connector is also supported by other manufactures of I2C equipment, which allows devices from different manufactures to be interchanged. Male Micro Match connectors that fits into this connector are available from various distributors and also from the Modtronix online store.
Particularly useful is the "male-on-wire" type connector, seeing that they can be crimped onto a standard 1.27mm ribbon cable. Multiple of these connectors can be daisy chained together to allow several I2C on a single bus. Pre made cables are also available from the Modtronix online store.

The pinouts of the Micro Match I2C connector is:

Micro Match Connector Pin	I2C Signal	SPI Signal
1	SDA - I2C data I/O	SDI - SPI data in
2	+5V	+5V
3	Ground	Ground
4	SCL - I2C clock	SCK - SPI clock
5	PIC port pin - Can be used as general purpose pin	SDO - SPI data out
6	No Connection	No Connection