126 and 127 was orphaned a long, long time ago. Polaroid (both sheet and pack formats) a while ago. Polaroid slide abandoned before really getting started with it (what a disappointment... but that might not count in this thread since I no longer have the processing equipment). 620 -- actually re-rolled 120 -- abandoned recently but might come back to be an interest of mine.
Other than that, I still shoot 35mm, MF and 4x5 as appropriate to the situation.