I came across this booklet discussing the halachic issues regarding the Flatbush Eruv.
Recently, I've noticed a strong campaign where flyers proclaiming the eruv to be posul were mass-mailed in Brooklyn. I assume that this would be in response, or to counteract, a similar large push to legitimize the Flatbush Eruv.
I haven't really read this yet. Have anyone of you?
(I did read Rabbi Wosner's haskama so far. Strong stuff)