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Pico_Train - 5:09 pm on Nov 26, 2007 (gmt 0)
At the same time, I've wondered if perhaps over a set time, links although still "live", "die", so to speak, that is they no longer give the boost they used to. I also suspect links from "reputable", "authoritative", "respected" and "high-end" domains do not die - Yahoo, ODP, New York Times, etc... Different from them being removed on an expired domain, change of ownership or page revamp.
I've wondered about this too since I've slacked a bit on some sites and as would be expected over time, lost some rankings, probably due to others increasing links more than my site.