In case you haven't had a reply about the location of the Mourning Warbler on Mt. Philo - from the top, going on the "down" road: there is a steep section at the beginning that takes a pretty good curve to the left - on the right side of the road just after the curve, back in the trees, the warbler has been singing consistantly for at least a week. I have yet to see it however! I will most likely be going up this weekend if you want to tag along.
p.s. you can drive up after 10am for $2.50, or walk earlier for nothing.