I try and spend a few minutes each week on blog housekeeping. Just checking that I delete sthapam and that photo's are in place. This helps two fold it makes sure all recent stuff is ok and I always do a bit to the meta description. Just by changing a few words Google's sea monkeys recognise it as being fresh and up to date. I am under the understanding Google have over three thousand algorithms to help them give recognition to web pages. I know that sounds lots but that's what has been bandied about and I tend to believe it. Anyone who does any SEO will know how hard it is to get decent page listings. I am of the opinion any small effort helped and if it is one of their three thousand hoops they want you to jump through all the better. Another trick that is not rocket science is fresh content and labels. Or on a website key words.keep them current and relevant. No good posting about tropical fish and key words relate to bicycles Google can tell the difference remember the three thousand? It may sound obvious but it may help you gain better ranking from search engines.