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Thanks to everybody who's weighed in on this discussion.   Do y'all think subfolders are the way to go for new web content for a big company with a well-established website even if the main site won't do much linking to the subfolder and the covered topics are separate?   Is much link mojo passed purely as a property of the domain's strength (if domain.com is reputable, domain.com/folder/ must be, too)?  Or is the majority of authority established because of the internal links?

Nicholas: I'll check with the good folks at SEOmoz support. Might take a while to get an answer. I'll let you know what I find. Cheers - Axel