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Concerning tip 4b., "A large burst of low-quality, non-authoritative, or bad-neighborhood links, though, can do a lot more harm than good; so keep things natural."

I don't believe this.  Self-proclaimed SEO "gurus" have been saying this for a while... but there's no evidence at all that you can do anything to hurt your site that another open user on the web could do.

Are you telling me that all I need to do to hurt my competitors is to submit their site(s) to a couple of thousand pr0 directories and that will hurt their rankings?  All that costs is about $50 for a directory submitter in India.

No... it will never hurt your site to be linked as many places on the net as possible.  Otherwise, anybody could kill anybody else's site easily.  Again, seo guys like to say this, but there's no evidence at all.