A circumnavigation (by auto) of Berlin Pond this morning (9:30-11:30 A.M.) produced a nice list of warblers:
Yellow Warbler (numerous); Northern Waterthrush (a couple seen, about a half dozen heard); Blackburnian Warbler; Magnolia Warbler (first of the season for me); Chestnut-sided Warbler (about 3); American Redstart (first-year male); Pine Warbler; and Common Yellowthroat.
also, in the heard-but-not-seen category, the following: Black-throated Blue Warbler, Black-throated Green Warbler, Ovenbird, and Yellow-rumped Warbler.
which suggests at least a couple (e.g. Nashville Warbler, Black-and-white Warbler) in the overlooked category.