Showdead shows killed threads and hellbanned comments.
Noprocrast locks you out of HN for minaway minutes once you have been logged in for maxvisit minutes.
Notifo is new to me. Maybe a public email address?
Delay is new to me as well.
Edit: Notifo is a push notifications service from a YC company. I'm guessing you paste in an API key and then get pings when your comments receive replies.
Yes, that's correct.
I think the main purpose of 'delay' is to allow you to edit your comments before the rest of HN sees it. A lot of us read through our comments and edit them after we submit (to cut out snark, clarify a point, make it more concise).
> Notifo is new to me. Maybe a public email address?
Notifo is a YC company: http://notifo.com/. They used to email you when people replied to your post on HN: http://notifo.com/hackernews. I'm not really sure if it's still working anymore, since they said they were shutting down a while back: http://blog.notifo.com/notifo.