Domains

Hello

I keep seeing people buying different domains for the same site for "SEO purposes". Such as aged domains or ones with keywords in them. Now I understand how this can be useful, but I am unsure as to how you get search engine to rate you on them.

I know all domains should be set up as a 301 redirect to the main domain, so how do you get the benefit of other domains? I mean what is the step by step process of getting the most out of "SEO friendly" domains, because if I am not mistaken search engines are only going to display the main domain for a site in their index, so I cant see how other domains help....

Any help would be highly apreciated!

By redirecting the "old" (new registered) domain it will look like all the old backlinks are pointing to your main site. So this is basically a method to get cheap backlinks for your main site.

ok and what about new domains (newly registered) domains which are jst more keyword rich? how do I get the benefit from those?