People have started to attempt to cheat the PR already with links in to their index page. So google moves the importance of this onto all the pages in a site giving you an average pagerank which effects the index overall. For example if you do free layouts or tutorials chances are people are linking to these in massive amounts these link won't point to your home page but to the page the tutorial is on, thus increasing the imporatance of having free things for people.
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"A computer lets you make more mistakes faster than any invention in human history...
....with the possible exceptions of handguns and tequila."
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