There are 6 in all (and there's quite a degree of symmetry, which helps a lot) but I hope your list is comprehensive, brendan - I hadn't heard of 4 of them, so I had to guess+google a couple of times.
The reason I'm puzzled by the half of one is because it requires filling in 2 cells and is only the second word of a two word title (it's runs diagonally from the bottom towards the top)