Best URL example: Am I doing it wrong?

[komeksimas]

This post is deleted!

[vironc]

Take a look at this in-depth input, coming right from the horse's (Google) mouth:

http://googlewebmastercentral.blogspot.in/2008/09/dynamic-urls-vs-static-urls.html

Also, on Google Webmasters Tool, you can make use of the URL parameter handling tool.

[komeksimas]

So basically it's better to keep those parameters, but show only less of them where possible. It answered my questions 4) and 6).

Another thing is whether putting a (category or brand) word next to domain is better than on the end of a URL? (i.e. domain.com/sony/tvs or domain.com/tv/sony) Which one would get higher result on SERP "tv" or "sony" in both cases? Or maybe they both serves the same?

And the final is what good or bad could happen if someone put the same keyword in all site's URL's? (i.e. I would be selling cars and my domain isn't included any word cars, so i put all of my pages in one folder like domain.com/cheap-cars/etc)