Dr. Garcia (Orion) let me know of an updated paper on his site (Targeting Documents and Terms Through Co-Occurrence Data) regarding a method for finding which of 2 terms in a 2-word phrase has a higher probablity of being targeted/found by the search engines in FINDALL mode (which is the default at all of the major SEs). It's unusually concise for a paper of his and should be worthwhile 5-10 minute reading for any SEO who wants to know how to perform an analysis of a phrase.
The example Dr. Garcia uses is "car insurance" and he shows, clearly, how to arrive at the fact that a page targeting the phrase would do better to optimize leaning towards "insurance" than "car".
Choosing the right keywords for your website can be quite a difficult task. It is extremely important to research the internet for the most competitive key phrases and choose words that are relevant to your website. Implementing areas will also benefit your site and can be mixed and matched with keywords to produce more phrases. Good post - it would be better if you could go into more depth about how to research for specific links and how to incorporate them into a website.