Over the next couple of weeks I will be de-mystifying everything there is to know (mostly) about how to properly adjust your rear derailleur. Ever wonder what all those little screws do? Ever shake your head at the mechanic that can perfectly adjust your shifting with 1/2 turn of a wrench after you've been suffereing with poor shifting for a month? This will be your one stop centre for all things rear derailleur.
How-To: Hanger alignment
How-To: Adjust limit screws