Mary-Sue's, love them or hate them. Oh good god how I hate them. here you'll find essays, studies, and exploits of Mary-Sue hunters. But whatever you do, for the love of god, don't encourage them.
Essays
How to Write a Mary-Sue

10 signs you may be a Mary-Sue

Get off him!: A guide to proper etiqutte in Fiction
Stories
The many deaths of Mary-Sue
First written as a sort of therapy, this is a series exploring the many ways I think it's funny for Mary-Sues to die. Look For Walk-ons of your favorite characters. Or not.
Mary-Sue: Electric Boogaloo
Again?
Aside from the awful title, this is the first of the series, but not the first written. It occupies multiple chapters, and has a fresh pine scent!
A sweet little oneshot where Cade meets a magical girl, and blows her straight to hell.
Chapter 1: In which we find the Mary-Sue

Chapter 2:
In which we get fed up with her, and get sick at the sight of her bathing

Chapter 3: I
n which we find that I've dropped my latte.

Chapter 4:
Le Conclusion