Forum Moderators: open
Bearing in mind this is the Adsense forum, would I be right in thinking that search engine position is important to gain maximum exposure for adverts? If you are trying to make a site purely for the purposes of making Googlebucks, then you might save yourself some time and effort by looking at the threads regarding the new features for advertisers that are being introduced.
If you could clarify what you would like us to answer as regards Adsense, then we could give you more precise information.
Currently, advertisers who want to put their ads on content sites (us lot's websites) have to bid on keywords, but have no say where their ads will appear. There are a *lot* of sites around that exist for the purpose of getting earnings from Google ads. Usually they have no content other than keywords and content scraped from other sites, but have managed to optimise their sites for high positions on search engines.
Now it may be that clicks from these sites don't generate sales for the advertisers, and consequently advertisers won't want to waste their budgets on them. The effect of the new changes may be that in order to get well paid ads on a site, the webmaster will need to provide a site that works for the advertisers. Currently you can get well paid ads without having to provide anything more than pages that can get the right ads to show.
Many of us believe that the webmasters that will get squeezed are those sites that are made for adsense, and scraper sites, with the content rich sites benefitting.
To answer your question, in order to do well on adsense, a webmaster needs to provide a quality site that people want to visit, and it will also need to have clicks that generate sales for the advertiser. So it's more than simply having a site up in the top of the search engine rankings - quality counts. Quality doesn't necessarily mean hundreds of pages. My site has several hundred pages, but virtually all the income comes from just one page!