I learned about all those sorting algorithms in school.
It's good to see that people continue to think about them after school. Truthfully the only time I've used these sorts is in school.

On a side note I'd just like to say that I like using Perl's Stack methods much more than C++, which I learned them in. This relevant because it's one of those things you learn in school and then never see too often in the real world.
-Rage