I remember two things: possible Flash corruption and possible EEPROM corruption. Was there anything else?
Quiescent current is ~22-25µA with the BOD enabled, and <0.5µA with it disabled. As a practical matter, it probably makes no difference whatsoever
Well, that depends on the application.
but half a microamp is just too cool!
Agreed!
As far as I can tell, the 85V (internal oscillator at 1 MHz) is reliable down to 1.6 volts. The alkaline batteries I use (two AA) consistently die between 1.6 V and 1.8 V. For me, the nice thing about sans BOD is that I can run the batteries essentially dead.
For the next gadget, my plan is to add Vcc measuring...
http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1294478456/all
Running an 85V, the alkaline batteries have a long linear voltage range so the gadget should be able to roughly estimate the time-to-death.