[aaronwall]

One of my buddies that got into SEO a half decade before I did mentioned the copy and paste rankeroo stuff was real popular back in the days of Infoseek, Altavista, Excite, Lycos and similar.

Google looks for the canonical version of a document and then deduplicates before returning the result set.

You can add &filter=0 to the end of the search URL for a particular query to turn off the duplicate content filters.

An old school spam technique for some affiliates in the early days of Google was to buy a high PR link to their affiliate URL so that like site.com/?aff=123 would be the default version of the homepage & the branded searches for the merchant would then owe the affiliate the commissions until the rankings shifted again.