To optimize your website with e-book submission, first you need to write an e-book then it should be submitted to free e-book publishing sites.
Yeah the post above summarizes the general tactic, but unfortunately most of these sites won't actually lead to decent traffic or downloads of your ebook. Better off using an article marketing campaign.
E-book is the online book. Like directory submission and article submission, some websites offers e-book submission. The e-book submission is useful to increase traffic.
just write your own e-book or if you don't have time create an e-guide. Once you have created it you can give it away for free, by submitting it to various free e-book sites. It's a great viral appraoch to helping you promote your site and create more visitor traffic but it can be time consuming. I've written an article about how to create, promote and market an e-book or e guide, you can view it via http://www.friendsandmoney.co.uk/make-money-online-ebook.html