Google has, for months now, been putting a heavy emphasis on quality of search results.
They’ve even gone so far as to announce an algorithm change at the time it was made (the so-called “Panda” update).
Now Google’s head of Search Quality, Amit Singhal, has written a blog post giving a detailed series of questions to ask yourself. He of course states these aren’t Google’s algorithm signals. They are something even more valuable.
A guide to what Google thinks makes quality content, quality:
The essence of “White-Hat” SEO is to try and work WITH Google and how it thinks. If you do that, over time, as Google improves its algorithms, your rankings will tend to improve or at worst maintain.
And if you are having ranking problems, this list is a good place to start.
See how you stack up against them.