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I have 2 domain names - 1 for a blog - the domain name contains key words related to the main subject of the blog. The 2nd is the main website with a domain name = company name - no key words.  The blog and main website are about the same subject. SEOMoz link analysis indicates that the main website is getting domain authority credit from the large number of links from the blog to the main website. The blog website gets more traffic than the main website and Google Analytics data indicates that we are getting a low number of referrals from the blog to the main website. If I can increase the referral traffic from the blog site to the main website do you think the link credit from the blog to the main website warrants keeping the sites separate or do people think the blog and the main website should be under the same domain name? Please share your thoughts - I need advice!