Formats:
35mm: Many Nikons
Digital: Three Canon 1DsMkII's
6x6: Three Hasselblads
6x7: Pentax, Mamiya
6x9: Three Fuji 690s
4x5: 0ne Cambo, Two Toyo Gs
8x10: Three Toyo Gs
As of December 2011: I'm designing a 5x7 aerial camera that I'll build in my machine shop. Also I'm altering some extra Toyo G parts to make a 4x5 aerial camera.