Quality content is key! Your site needs to have quality content. There are a lot of people who think on forums, for example, that massive long posts will give you lots of views. This is not always the case, it is the quality of the posts that matter. That was a bit off topic but it does relate to this because quality is key and that is what you sould focus on in any search engine.
I know on forums you can sometimes see a robot in the 'users online' or whatever its called on your forum, part. It should say Google quite often. Sometimes it will say Bing or some other search engine.