I miss HyperCard. I guess you can do most of it in Keynote, though (Apple's version of PowerPoint). There are also websites. I don't think HyperCard did anything a web page couldn't.
It was fun to play with, though. I built a bibliography of Stephen King books in school. I remember bringing all my SK books from home to scan the covers. Borrowed a couple from the library (this was in high school, and yes, they actually had a couple). I may have gotten some covers online, but I'm not sure. It was a long time ago. You could easily find them now, but back then I'm not so sure.