The JeeNode Micro (v3) is the skinny younger brother of the JeeNode - 15 x 47 mm, and just 3.5 mm tall, from using a thin PCB and an extra-flat wireless module. The two ports (not four) of the ATtiny84 processor are enough connectivity for many pint sized applications.
The JeeNode Micro (or JNµ) is aimed at more advanced makers. Software