> > http://www.romanblack.com/self_swi.htm
> >
> > I'm not sure it meets all the OPs requirements,
> > but interesting non the less.
>
> I think it does

Ah, I should qualify that. It does meet power switching
needs, but because the length of time the circuit is on
for is user-determined, a way of telling the PIC to power
down is needed. Possibly this can be done via an R or
D from the existing pushbutton to a pin, ie once the s/w
is running it can look for a push

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