Here's a clip on 12 Search Engine Marketing Campaign Mistakes To Avoid. Even though it's over 6 minutes long, that's really only 30 seconds per tip, so the time just flies. Nonetheless, if you're too impatient to sit still and be talked at for the next 387 seconds, I've summed up the dozen SEO fallacies for you below -- even adding my own two sense in brackets on some of them.

1. Poor Training [this firms thinks that SEO is better left outsourced -- quelle surprise!]
2. Miss Diagnosing Your SEO Viability
3. Limited ROI Strategy
4. Choosing Wrong Keywords [here they encourage you to go after a mixed portfolio and look toward the longtail]
5. Half-Hearted Effort [apparently SEO is completely separate from all other forms of online marketing and, therefore, deserves undivided expert attention -- quelle surprise encore une fois]
6. No Link Bait
7. Don't Ignore Social Networks [they're talking about more than networking itself and encourage you to have blog -- hah, I told you so!]
8. Putting Up With Limited Content [hint: Google loves length and depth]
9. Lousy Rank Analysis [it's about more than Page Rank or Alexa]
10. Keyword Stuffing
11. Failing to Think Holistically [despite mistake #1, even this guy acknowledges that SEO campaigns have to go with PPC, links, online PR, and permission based email marketing
12. Blind Eye to Industry Trends