I was thinking about this for one of my sites. Whether to make a sub-domain or a sub-folder - which is better for "better rankings" in the SERP's. There seems to still some controversy about the above! I know some SB sites like SU use sub -domains, Benj used sub-domains to get into 2nd position in seocontest2008, OWG swears by sub-domains! On the other hand, Squidoo uses sub-folders! That said, i came across this post and i quote it here- "Subdomains and subfolders both have their advantages, especially when setting up blogs. For blogs, I prefer a subfolder w*w.fhefh.c*m/news because the link juice which is sent to that blog is going to be naturally distributed to that main domain, and other subfolders under the domain. Futhermore, the forum/blog will default logo, home page and other links back to the subfolder. If you set this up with a subdomain, by default, the links in the forum/blog itself will all point back to the subdomain. So, with a subfolder, both the inbound and internal linking structure favor the entire site. With a subdomain, the forum or blog will be listed as a separate entity in the Google search results, which is good for owning the results and one’s reputation management. However, Google and other engines will generally not list more than two of these subdomains in the search results, unless those subdomains can prove to Google that they are independent and relevant entities." So, in conclusion, if you’d like to build the equity of one web site or entity, I suggest using a subfolder. If you’d like to build an entire new entity with its own equity, launch a subdomain. Read more here I thought, I will share it here so that guys who are in the same dilemma will be guided. Any thoughts or opinions/personal experiences will be appreciated!