Just FYI, if you are getting a JeeNode kit from Modern Device, the regulator has the wrong pinout. I have also informed Modern Device of this.
I just got two JeeNode v.4 kits from ModernDevice.com and assembled one of them this morning. Hooked it up to a 3xAA battery pack and the TO-92 regulator started to burn up. It was installed just as the silkscreen showed. The rest of the board is fine; I am now powering it with +3.3V from a FTDI USB chip hooked up directly to Vcc.
I have removed and now misplaced the burned-up part, but looking at the new part in the other, yet-to-be assembled kit, it is ST-Micro L4931 33.
Looking at the L4931 data sheet, and looking at the board, they are different.
Datasheet: 1=Vout, 2=GND, 3=Vin JN v4 PCB: 1=GND, 2=Vin, 3=Vout
So installing the regulator as the silkcreen shows, puts negative EXTERNAL PWR voltage relative to ground, into the output pin of the L4931 regulator... not good.
Note, JeeNode v.4 schematic at JeeLabs.net calls for Microchip MCP1702-33 as the voltage regulator. Its pinout matches the board and had that part been used, the board would have worked.