Computation Expressions in context

I heard that computation expressions are kind of like monads. I heard that monads are like burritos or space suits, and that they are pretty much magical. I also heard that they are monoids in the category of endofunctors...

As a writer of code that sounds awesome, and I want to know and understand (and I'm sure you do too) what those terms actually mean, and most importantly why we should care about them. What are their practical uses? So, in this talk we are going to attempt to do just that. Failure is possible, but the attempt is valuable.