1. Thou shall not send e-mail spam; Build a following instead.
A high quality e-mail list, one that provides much value to the reader, re-enforces industry leadership. If you're not a good writer, find a good editor to turn your material into quality content. Content is king, and the recent flood of social networks is making sharing content easier than ever.
2. Thou shall not post the same thing across dozens of community sites; Become a valuable part of the communities instead.
Don't forget to monitor social networks for people talking about your brand, they count as communities too. From a customer service perspective, customers usually appreciate the added effort. This is your chance to turn a customer into someone that preaches your brand to everyone they know.
3. Thou shall not buy links for pennies on the dollar; They could get you banned, and ethical link building is much more effective.
4. Thou shall not use automated spam software.
I know it's tempting but you have to resist, it's just not worth it. Google will delist you, everyone will hate you, your website will get blacklisted, e-mail providers will stop accepting your mail, etc. There's no need to force your product onto anyone with spam; Fantastic new marketing opportunities are all over the place lately.
5. Thou shall not ask questions about thy own product, then answer it with a different account.
6. Thou shall not market without analytics software.
Numbers, graphs, and data analytics for any type of marketing is infinitely more useful than shooting in the dark and hoping for the best. If every step of your marketing strategy isn't driven by data analytics, then you're doing it wrong.