Bing recently came out with their version of an SEO check list that all internet marketers should be trying to follow in some sort of way. Some of the bullet points are very important to talk about and fit into the overall search engine optimization equation very well. Let's pull out a few that I think are the most important. " 13.Create a custom 404 page so that even if someone encounters an error on your site, they are re-directed somewhere nice." Huge!