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I'm writing an article on Black Hat SEO and was wondering if anyone knew of any techniques not included in the list below.

Is anything missing?

Keyword stuffing, invisible text, doorway pages, link spamming (link farms), blog spamming, cloaking

You are missing a TON of techniques. The only thing that is Black Hat from the list above is Cloaking.

There is a BIG difference between Black Hat and Spamming.