Here's something that until I acquired it I had never seen before, though I knew it had to exist: An Australian Daybill.
A daybill is a little like a US insert, but smaller at only 13x30 inches. The art on the daybill is adapted from the pervasive advertising art first seen in January 1951 in Life Magazine. The quickest way to identify an Australian daybill (without a tape measure) is to look for the triangular emblem on the poster stating For General Exhibition.
Daybills are very popular among movie poster collectors due to their size - almost every home has wall space for something 13x30, while very few homes have wall space for a 6-sheet.