I have a question about sub-domains. I haven't really seen anybody touch on this, either positive or negative; so, I'm going to put it out there. How does using a sub-domain affect how the search engines rank a site? Let's say I have the domain name "isgreat.com" and I want to use it for niche sites and/or blogs. So, I create a sub-domain for a weight loss product and name it weightloss.isgreat.com and then I want a blog to review the weight loss product and I create weightloss.isgreat.com/blog With such a domain name (isgreat.com), I could create unlimited keyword rich niche and/or blog sites. What do the pros think? Thank you all and have a great evening.