A quick little "did you know?"
If your content has been crawled and cached by Google, it may not yet be fully indexed. Your page links may well appear in Google search, but as time goes on, Google builds more extensive statistical profiles of your content. It keeps mapping content that it already knows is there, but hasn't had time to "think" about yet and figure out how each piece of your content fits in with the next bit. This is why you could have launched an awesome site that may one day rank #1, but doesn't get there for ages, months, probably more than 6, or even 12, depending on how much content you have.
I watch stats all day long. It seems to be the flip side of content writing for me. The pattern I see from Google Webmaster Tools is that the Content Keywords list grows over time, even when you're not adding content to the site, and even though the content has been cached, it doesn't mean the 'micro-segments' within your content have been fully indexed. Physically mapped? Yes. Semantically mapped? No. The physical mapping is the first step of many, many more steps, each of which examine the data for slightly different reasons.
This is why rank takes time to establish. It's a hard one to explain to your SEO client who is asking 1 week after starting and SEO project with you: "why hasn't my rank gone up?", but that's how it is.