Yellow Pages is the most popular directory among all the places. Last time, most people would like to list their business in to this directory, but now, due to the advance of technology, most people would like to list their business over the online directory.
webhostingbluebook.org is a web hosting directory which contain web hosting article, tools and also web hosting directory. This website also contain a forum, I am look forward to gain more infomation over their discussion there. Top 10 world hosting company are listed there too.