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SEs, particularly Google, hate duplication, which simply clutters the web. Much better to have your content on one site (use your favorite .com - unless you have a spcifically 'local' audience), then use 301 forwards from every other domain name (www and non-www) to the chosen www.domain.com. Plus one from domain.com to www.domain.com.
Failing this, your multiple sites won't share the glory, they'll divide any success amongst them, plus all will need separate marketing effort.
301's are the way to go.
Generally you are better off controlling the domain that is 301'ing to the main domain, if for no other reason that to make sure that the redirect is happening properly. These days, a lot of hosts provide more than one domain per hosting account, so if you have a set up like that, you can organize your secondary domains with htaccess files to 301 to the main domain.
Thanks for that, i certainly have one domain thats being hammered for that transgression.
I work entirely in ASP.net/vb.net,, i found some 301 asp code on a brilliant thread here on webmasterworld, thanks www :)
question is, can I put just 1 page in each domain an put the 301 code in either the page load event or the global.asax file
I dunno if you prefer php, c# , perl but asp.net/vb.net is all I have