Moshu,
I don't understand why you don't understand this ... boreal is trying to explain to how create a professional look to a website - no visitor wants to search through archives on a sidebar. That is the point of having Page Tabs on the top of a website - for EASE of navigation.
Take a look at the site I am working on-
http://www.therecshow.com
I have Pages called "Movies" and "music" and "television", the tabs for which are at the top of the main blog page.
I want archived blog entries in the categories of "movies" and "music" and "television" to go on their respective pages ... for ease of navigation.
Sure, I could have a sidebar archive, but it looks like crap and defeats the purpose of having multiple actively updating pages.
Understand the difference?