I am totally confused now, What I was working on before were business sites, so it was easy for me to decide a key word to be promoted on the first page of Google.

However things are totally different now, The site PHPKode.com I am working on now is a PHP resources sharing site. It is hard for me to distinguish which key word should be decided to be the first one to promoted.

Moreover, once sitemap has been added on site, the indexed page in Google decreased from 5000 to 500 now.

Any expert here can provide me some constructive suggestions? Thanks very much!!!!