How do I delete items in my itunes download queue?
While an item is in the download queue, the user can't remove it. 

You could contact the iTunes Store Customer Support department, which, apparently, deals with this kind of stuff, or try this wibbly wobbly solution:


Go to the Download page and find the small down-pointing arrow icon next to the Download Error. Tap to Retry.
Put your finger on the arrow icon and do a quick swipe to the left.
The arrow will be replaced with a Delete button.
Tap and confirm.