John Gruber at Daring Fireball links today to this old video introducing HyperCard, featuring Bill Atkinson. If you know your Apple/Mac history at all, you know Atkinson's name. He's one of the Mac Immortals.
I was among the very first HyperCard users in the country and was a member of the original HyperCard Users Group. Did a lot with HyperCard, including a complete first year course in the Latin language. (This was back in my days as a professor.)
When it was clear HyperCard wasn't going to have a future, I committed to FileMaker Pro. That was around 2002. But I still miss HyperCard. It could do things that I still can't do in FileMaker, at least not nearly as easily. I've never quite forgiven Apple for killing HyperCard and don't understand why they did.