The Notorious Jumping Frog of Calaveras County: Very silly. Kind of charming, kind of pointless. I felt a bit like I was pranked by reading it at all.
The 1,000,000 Pound Bank Note: Also charming! I'm told this was made into a movie. I can see it -- it's a little too optimistic and fantastical for my taste, but pretty funny.
The Man That Corrupted Hadleyburg: The story I enjoyed the most, I think. Deals with morality, virtue, guilt, and how easily money corrupts. Quite cynical, quite fun.
The Mysterious Stranger: It's been a while since a short story has made me this existential. After I finished reading I had to get up and walk around to convince myself that I am real (or at the very least that if I'm not, there's no point in operating like I'm not). So depressing and dark, such a naturalistic and existential view of all the brutality of human nature, and such a dire view of religion! It's the longest one, more of a novella. I can see why it's the name of the collection.