Just look on the actual domain names. Many of them have actual meaning and most likely were registered for some particular business. Than later on business went belly up or company just don't have resources to support website and here you go - new blog or new directory...
It is almost impossible for the site with real pr4 or pr5 home page not to have at least pr0 for some of the inner pages. Also 0 Alexa traffic is a good indicator of the dropped domain...
Some time ago these type of high ranked dropped domains were mostly used for the tag clouds, but now it's a perfect start for the auto-blog or flight-by-night directory to sell some links before PR is dropped
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