I've noticed the same thing. I suspect Alexa is simply indexing more sites at a faster pace, which pushes everyone's rankings down unless they're growing traffic very quickly.
During the period where Alexa shows StevePavlina.com's ranking decreasing, web traffic has been slowly but steadily increasing. October 2007 was the highest traffic month ever in terms of visitors, page views, and bandwidth. This site used almost 1TB of bandwidth last month.
Alexa is good for getting a basic idea of a site's traffic and its relative ranking to other sites. Beyond that it's less reliable.
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