Chris, from the htaccess that you posted, it doesn't look like you are actually redirecting the non-www versions of the other names as well. (I just tried http://theliteraturenetwork.com and sure enough it didn't redirect.
You could replace all those lines with this:
Code:
RewriteCond %{HTTP_HOST} !^www\.online-literature\.com [NC]
RewriteRule ^(.*)$ http://www.online-literature.com/$1 [L,R=301]
This will take care of all the cases yours currently does as well as the non-www versions that it currently doesn't. The "!" is a negative operator so its bascially saying if the host is not www.online-literature.com then redirect it to that, which is more efficient than checking each other case.
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