Here is an image of all my loot from 38 boss kills so far (in 3 days). I already used all the big XP bottles, so only this isn't in the image, all the other items are the exact loot. Unfortunately, I haven't encountered any superboss yet.

Stay tuned, as I will post more pictures later of more boss kills!
EDIT: The V books are sharpness, the IV books are protection and the III book is unbreaking.
EDIT #2: The Strength III potions aren't included either because I use them for the boss fights. I've gotten about 25-ish though.
EDIT #3: Doesn't include money earned obviously, either, and the perfect diamonds neither because I used them (today I received my 3 first perfect diamonds, sweet!).
~ Rob.