Well, the birds are clearly on the move here in Grand Rapids, as documented by radar and moon-watching by Dave Slager:
Here are my recent highlights from Huff Park, including a map showing where the Olive-sided Flycatcher and primary warbler flocks are hanging out:
Olive Sided Flycatcher- 1 singing! (see attached map)
PURPLE FINCH- 3, our first for the park
Blackburnian Warbler- 2
Black-throated Blue Warbler- 1
Sedge Wren- 2 singing
lots of other warblers: Tennesee, Wilson's, Black-throated Green, Maagnolia, Redstart, Black-and-White, Baypoll, Ovenbird, etc.
Olive-sided Flycatcher, 1
Yellow-bellied Flycatcher 1
large mixed warbler flocks.
Get out there and enjoy 'em!