This JST ZH 1.5mm spaced micro connector, with a female pigtail and male PCB connector. Currently used on the NanoDuino robot controller, and is a nice compromise of size when 3-pin 0.1" headers are too big, and 0.050" are too small. Some brands of sub-micro size hobby servos use these connectors as well.
The male connector can be easily soldered to the NanoDuino board, or any other board that supports this connector.
This connector is keyed, making it difficult to insert backwards, an important feature on devices that don't have power input protection diodes, or other I/O protection!