If you're going to make a web application that displays items in a list, please allow me to sort that list newest-first or oldest-first. It's just a personal preference that I'd rather have oldest first, but most websites only show newest-first. In a queue (oldest first) you will eventually get to everything, no matter how long it takes or how fast you add new items. In a stack (newest first) you might never reach the bottom, which means your oldest additions get neglected forever. I'd rather get to them eventually than bury them under an avalanche of cute cats falling off things.
Mokalus of Borg
PS - Also, an auto-archive feature for processed items would be handy.
PPS - Especially in places like my YouTube Watch Later list.