I was with you until "and I can't recall anything like this for any other software."
From the top of my head
Ajax (very handy but lot of times misused and misunderstood or just DHTML)
No SQL (can be handy, but for some people it is like a religion)
XML (why use CSV when you are able to use XML)
Cloud (Oh by cloud you mean the internet?)
and many more :)