When you look at directory submission earlier and recently there have been a lot of paid or bid directories popping up in the market. The whole idea of the exercise is to create more back links to your website or blog thus choosing strong web directories which will be around for some time is important.
Your site library is one such directory but it differs from other directories in a large number of ways. You are allowed to submit links in any language, and the website has the Google translate facility, which makes it accessible to more people around the world.
A number of articles and white papers have been written on this topic. Before the days of Google and Web 2.0 there was little attention paid to the topic of Search Engine Optimization (SEO). In the early days of the Internet Era you could get a site listed on Yahoo! or Altavista by merely submitting it. As long as it wasn't too complicated for search engines to understand you could get your site listed within 2 to 3 days. But Yahoo!