>I'm assuming here that we are current limiting to reduce the current
>potential of the RA.0 pin? But, couldn't there be a problem with
>over-resisting and have our HIGH not high enough?

Limiting the current to conserve power, yes (especially when the key is
pressed).

The reason I asked is because a high value resistor would allow the thing
to pick up on noise easier.  A lower value keeps the noise threshold down
by having so much more current flowing all the time.

Andy