My personal favourites were the photography exhibitions 'New Photography 2010' and 'Pictures by Women: A History of Modern Photography'.
I could just see them again and again....
Ilse Bing. Self-Portrait in Mirrors.
Barbara Morgan. Martha Graham, "Letter To the World".
Nan Goldin. Nan and Brian in Bed.
Sally Mann. Untitled.
Pictures found here.
MoMA is free of charge every Friday between four and eight - but have really good membership deals if you want to visit often.