On Wed, 4 Jan 2012 15:03:35 -0800 (PST), Matthew Moore
wrote:

Bathroom entrance has a toggle switch that activates lights over the
sink and toilet. To eliminate the toggle switch as the problem it was
removed and the exposed black hots were connected, and good
connections on the neutral running through the swithc box were
verified. The same was done on switches in each of the walk-in
closets with their respective switched overhead lights. After power
restoration ~120-volts black-to-ground is measured at each receptacle,
a little less (~110 volts) on each receptacle neutral-to-ground, but
bulbs don't illuminate. Does this sound like a loose neutral
connection between the bathroom and the main panel? Its not a main
panel breaker fault as other outlets on the same circuit (outside the
bathroom) are juiced. Thanks in advance for any replies.

Try replacing the bulbs first. (with the switch on)