There are people here that need to watch Day9's daily shows to learn more about sc2 and its degree of depth. He really fleshes out a single strategy and in the same moment, he opens the possibilities of thinking outside of the norm in a very stable and viable way.
The way he explained strategies used by Dimaga, TLO, Nony, Artosis, diewilde (?) and others, has really opened up how you can use different strategies in various matchups in ways you yourself don't usually play.
Seriously, if you're looking for depth of gameplay, watch his dailies.
Here is the link:
http://day9tv.blip.tv/