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1) Msg #9 in: Difference between a log analyzer and a stats software [webmasterworld.com]
2) Msg #9 in: Learning more about Googlebots behaviour on my site. [webmasterworld.com]
These two posts should answer most of your questions (and probably give birth to a few new ones) - they complement each other, as the two compilations have a slightly different perspective on the topic.