Wednesday's guide discusses how to play various stack sizes and the situations you find yourself in poker.
"Keeping score in poker is fairly easy. The more chips you have, the better you are doing. If you keep in mind how your chip stacks are doing relative to your opponents and to the blinds, you have all the elements you need in understanding the pivotal role stack size has in No Limit Texas Hold’em. When you have a bigger stack than your opponents, they are the ones who are at risk at every turn of going out, while you aren’t at risk. This element imposes both a psychological and mathematical advantage to players with bigger stacks. A person’s stack size affects the strategy at the table in numerous ways. "
The article can be found in the beginner guides sub section of poker guides area of the poker section in the sub tabs.