If you want to have a different template for certain sections of your web site, that use different templates is the best way to use Wordpress MU? I did that for: http://lasvegasmassage.com/ http://lasvegasmassage.com/las-vegas-spas/ http://lasvegasmassage.com/las-vegas-asian-massage/ But I have a feeling this is not good for SEO as the three sites have different site maps. Would i have been better off just doing subdomains? I am going to do a new site which will use a wordpress directory site (i cant use just a different page template as it is a detailed directory software) on one section and I want to know if I should do it as a sub, or use wordpress MU again: www.site.com www.site.com/directory