This 7 minute and 50 second video is one of the first SEO videos I made. After reviewing it I realize I could have moved the screen around to show a few more examples of the stuff I was talking about. Rather than discussing one topic this video moves around to offer a wide array of marketing optimization ideas.

Domain name & site design: using a strong domain name helps you look more credible and helps you rank better. An original high quality site design also makes content appear more trustworthy.
Logo & homepage page title: place your keywords in your logo. Instead of using Paypal as your logo, use something like Paypal payment solutions or Paypal online payments. You can still emphasize the Paypal name while benefiting from enhanced inbound anchor text due to keyword proximity, and some people perceiving your official name as containing the associated keywords.
Title of articles & filenames: use at least one keyword phrase in your page title and make your filenames descriptive. Doing so will help you build descriptive inbound links. Some people link using your page title as the anchor text, this is especially true if your page title is short and memorable. Many authoritative websites cite sources using the full URL with filename in the anchor text.
Minimize duplication: mixing up your on page seo, page titles, and meta descriptions helps you rank for a wider net of keywords and makes your rankings more stable
Leverage your authority: add useful descriptive background text below the fold on high authority pages. Also consider adding more internal links on high authority pages.
Buying links: when buying them, consider buying links indirectly through payment schemes involving community participation and discussion, such as contests and affiliate programs.
Syndication: if your content is published on other sites, make sure to reference older posts on your site to drive that traffic stream and link equity back to your site.
Drunken spelling: if you have a community aspect to your site, don't correct misspellings. In fact, some publishers might even place fake reviews and comments on their sites to help capture misspelled keywords without raising their risk profiles.
Spammy examples: find reasons to discuss spammy high margin topics on high authority websites by relating them to your core business. If your relation is a bit of a stretch, consider backdating it or finding another way to place the story on a part of your site that does not have thousands of people reading every word.