Canonical Urls

Hi to all this is my first post and in this I am discussing about some canonical URL issues with you all .According to mattcutts"Canonicalization is the process of picking the best URL when there are several choices, and it usually refers to home pages". For example, most people would consider these the same URLs:
www.example.com
example.com/
www.example.com/index.html
example.com/home.asp
But technically these are different URL's.
So the question is how we can solve this problem.For this yo u can do following things
Pick the url that you want and use that Url Consistently across your entire site i.e., Don't make half ofg your links go to http://example.com/ and the other half go to http://www.example.com/. Pick the url you want to prefer most.
Google recomend to do permanent (301)redirection i.e., Do 301 redirection on url's means to say that if someone reqest http://example.com/.It redirects to http://www.example.com/.
Dont' do the following
Don't use URL domain tool:Sometime what we do that we use URL removal tool to remove domain.In this way if we want to do so we must send reinclusion request and also with the mention that we remove entire domain by mistaken using the URL removal tool and that you would like it reincluded .