I found this article really interesting, the importance of continued SEO work cannot be stressed enough. Just because you have reached the first page of Google search results doesn’t mean you can quit SEO work. Having a continued strategy helps you to stay ahead of the competition, after all they are trying to get to where you are. Google search algorithms are changing and evolving to keep track of your content, make sure it is updated and current. Getting to the top of the page is great, but you have to work just as hard to stay there. To check out the original article: http://blog.boostability.com/so-youve-reached-first-page-rankings-on-google-now-what/