In your opinion what have you found the best results with as far as SEO goes in regards to semi related content? What I do know is. -Sub domains are great if you have alot of unrelated content. For example adult.domain.tdl and internetbusiness.domain.tdl Since porn and internet business don't mix too well it's obvious to make a division so they are not indexed together. However which would be better if say you have alot of internet business related content? With semi related topics like marketing, blogging, and ppc Would you be better off with a normal wordpress installation and just separate the topics by category, or create a WPMU installation and separate those topics into sparate sub directiry sites? All comments and opinions welcome, verbose explainations preffered.