I've just seen Pet Shop of Horrors and thought it was pretty good...ever since I first got into anime I've wanted to find a series that was dark etc...closest I've come is PSoH and Hellsing (and Hellsing isn't even all that dark at all) so I was wondering if anyone had any recommendations. Also I saw Perfect Blue which is pretty cool...

I've heard (very briefly) about Full Metal Alchemist so I might check that out at some point though I don't have a clue what its about...but I could do with something that I could download by episode as all my BT downloads at the moment are more than a gigabyte and I need something new to watch.

Any horror/dark anime (preferably series or ova's but films'd be ok too).