Well, I managed to get the 168V to work with my NG board just fine.
That was pretty satisfying actually, since it was the first time I have attempted to burn the bootloader and the first time I have tried to use my USBtinyISP kit.
Now I know how people can get so excited over getting that LED to flash.
For the record, the fuses I used were:
Low: 0xFF High: 0xDF Extended: 0x00
I found the e-textile page very helpful for getting a better idea of setting fuses for low power
slanbuas, I encourage you to give it a try, the 168V looks pretty good for low power use. If you look at the datasheet, a 168V running at 1Mhz uses only .55 mA, compare that to the idle current of the standard Arduino at 20ma - not bad!