I can't speak from having any experience, but I think the domain name itself does carry a significant bit of weight, especially in conjunction with incoming link text. For example
lesbian pics... The site isn't all that special, doesn't have tons of quality back links, but the domain, link back text, and content all cater to 'lesbian pics', and therefore the high ranking.
Ultimately though, I think the linked text on incoming links, and the content make up the majority of 'PR' and in turn SERPs, pretty much reguardless of the domain name ( hence linklists kicking ass in G ). Who knows really?
I've got some similar testing in the works soon too, only I'm going the other way with it.. buying domains with keywords in them. Maybe I'll PM you in a few mos and we can exchange findings

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