Good Seo : Art or Science of Search Engine Optimization (SEO)

Usage of internet all over the world is on constant rise and newer technologies have come up to make it faster and better. Earlier dial-up connection was used by most of the internet users but now broadband is replacing it. Yet major portion of net users are hooked to dial-up connection for web connection.
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You may have noticed a recent trend on Google lately. They seem to be integrating their different vertical engines such as Image and Blog search, into the normal search results. For certain search queries, you even see a few images appear above the webpage results.