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We currently own two sites (with unique domains) that accomplish a similar goal, but are completely different (so there's no duplicate content, etc) and were developed independently. Both sites have very good pagerank due to great press and inbound links over several years. Also both have thousands of pages and get a lot of inbound deep links. We plan on shutting one of the sites down so we can focus on the other. We'd like to transfer as much traffic and SEO/pagerank value from the one we're shutting down to the one we're continuing to focus on. What's the best way to do that? Should we just do a 301 redirect? Or keep the site running in some diminished form and link it to the site we're focusing on? I saw SEOmoz has a good guide on moving sites http://www.seomoz.org/learn-seo/redirection which recommends a 301 redirect, but I wanted to see if the same applies when merging sites as we are in this case.