We heard, and finally spotted a Golden Winged Warbler soon after entering the trail. Very good look by 5 of us, pictures available.
Farther in (half mile or so) we chased a Blue Winged song for what seemed like an hour. Finally, as we were giving up and preparing to leave we spotted a Brewsters (yellow cap, white underparts and under tail, black eye line, yellow wing bars). Unfortunately no pictures this time, but we all had a good look, and wrote out our description before we checked the reference.
This is in Weybridge, just north of Middlebury.