Welcome to Multiplayer Game Development, also known as Hell.
If you have tried to look up First Person Shooter "AAA" Multiplayer Programming you've probably found very little on the subject. While I understand why the big game development houses keep that information under wraps. . . it still sucks none the less. So, I've decided to help out a little bit.
Here are the few resources that I have found on the web, and please feel free to add any blogs/articles/books that you know of in the comments. We're all in this together.