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Why don't you go to their web sites and check out what they really do? I think you will quickly see that they do not really have public "methods" that you can learn, or software you can use. Did somebody give you the idea that they do?
Seoram, if you go to the Web Analytics Demystified discussion group on Yahoo you will find a good list of books that will introduce you to web site analytics. I think you will really get a lot out of doing that kind of homework.
[edited by: McElvoy at 2:24 pm (utc) on Feb. 13, 2007]