I was reading Louis Rosenfelds book on Information Architecture. I loved Venn Diagram about Content-Context-Users. What I wished to highlight was the importance of the ternary relationship between the three and also the importance of each in the whole process.
A website is among things a means of communication of information. I wished to highlight how each of these factors affect the communication.

Content
Among the various activities involved when focussing on Content is Content Structuring.
Lets look at the sentence: A woman without her man is nothing
If structured as
A woman without her man, is nothing
communicates one idea
If structured as
A woman: without her, man is nothing
communicates exactly the opposite idea.
Hence it becomes critical that we understand the content structure and realise its importance
Context
Similarly about Context, Here we again we will take same content and apply different contexts to it and see how it affects the communication
I say :” The World is Flat”
The most probable reaction is : This guy must be nuts.
However if Thomas Friedman says that, it becomes a bestseller . What has changed is only the context but the it has a radical effect on the communication
Users
Again the same content being shown to different users affects the communication greatly.
There is ad about a soft drink from a Multi national company. They launch a “energy” drink in the Middle East. The creative was simple : A man is tired, he drinks the cold-drink, and he up and energetic again. However the campaign bombed. Because as is common all around the world, we read stuff from left-to-right. However in the Middle east, there content is read right-to-left. Hence the ad effectively communicated that an energetic man on drinking the stuff started feeling tired.
All these examples are probably extremes. But they help in highlighting the basics of three elements of the IA venn diagram