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I havent read through your posts... but the way search engine rankings are so accurate and useful is because they have had time to have enough users click on the relevant ones (clicks are tracked and most clicks means top position) to make it well rounded.
The spider is just the thing that crawls the internet looking for webpages to cache. Google keeps an index of all the webpages on the internet, and updates them periodically. What the spider does is its given a few key websites that have alot of links and all of the links on all of the websites are analyized and tracked to "mlik" out websites.... the spiders are consistently given websites that they think will lead to more material and eventually are able to stop doing that because most of the websites are found...
Anything else you want to know?
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