Google Secret New Engine, code name: Caffeine
Google made the unconventional move of announcing a potential major change to its organic search results algorithm. The announcement heralded “a secret project: a next-generation architecture for Google’s Web search.”
Every once in a while Google makes a major algorithmic change to its organic results. In reality, its organic algorithm changes at least monthly, if not more frequently, but the major changes are sometimes announced. Even when they aren’t, these changes are quickly named by the industry, like hurricanes named at the time they prove themselves able to do damage
Like prior major changes in the algorithm, Caffeine will profoundly affect the SEO industry and may impact your SEO rankings or traffic, positively or negatively. It may also significantly impact your PPC (AdWords) search strategy and that of your competitor.
Let’s look at the stated objective for Caffeine and imagine how these changes might shake things up, based on the attributes and dimensions that were mentioned in Google’s announcement.
Index Size and Speed
Problem: News sites and real-time blogging platforms, both within social media sites like Facebook and through sites like Twitter, generate a huge volume of content that is only fresh for a short time.
Solution: Google Caffeine will index, refresh and rank them faster.
Accuracy
Problem: Most people would agree that Google is fairly accurate now. However, for certain query types, its accuracy is still fairly poor. In particular, Google struggles with integrating local results into the organic results beyond the local results section.
Solution: Work harder on Google maps. Interestingly, with Caffeine I noticed less news included and more local business listings included. Of course, they aren’t always at the top; the top organic listings are generally not geocentric and are often links to a wiki or other reference site.
Personalization
Problem: The personalization extends beyond geographic data center issues to the user level. This means that even if you have what looks like a top organic position, you may not have that position for everyone who searches.
Solution: You’ll have to make your own determination based on what your lost opportunity might be. I recommend testing paid listings even when you have a top organic listing.
Try it now with your own keywords www2.sandbox.google.com and report me with your findings!

Q: We want to rank better for certain keywords in Google.
The links shown below some sites in our search results, called sitelinks, are meant to help users navigate your site. Our systems analyze the link structure of your site to find shortcuts that will save users time and allow them to quickly find the information they’re looking for. 
I believe that Google is counting how many people are using the “I’m Feeling Lucky” option. Technically it’s very simple as the core search engine needs to redirect you to the first position in its results set, so it “clicks” in your behalf on this organic listing. So now that it knows the URL, why not to save it to a database and give higher ranking score for more frequent “luckiers”? It’s simple as that!