Ask HN: Open-Source Pastebin clone, what features would you want?

I'm creating an open-source pastebin clone right now for internal use at my company, we plan to open-source it once it's in a usable state. What I would like to know from HN is what features would you like to see in a pastebin clone? Expiry dates, syntax highlighting, user accounts, etc.

The plan is to make this easily deployable by anyone who doesn't want to expose their possibly sensitive pastes to the internet, they can stand it up on their own servers.