The google.com website contains a great deal of information on how to design a google.com friendly website. Take a look at there section for webmasters which includes detailed information on designing a google.com friendly website and what not to do.

msn.com provides information on there website on how they rank your website and categorize your website in their database.

yahoo.com is another valuable resource that can be used to help you develop your presence on the Internet. This link provides access to their search ranking help pages.

Page Rank Uncovered by Chris Ridings is a must read document if you are interested in learning more about Page Rank.