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rocknbil - 6:47 pm on Jun 26, 2010 (gmt 0)
Ignore it no, someone comes to your site and gets a 404, **poof** goes one more opportunity.
Apache?
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteRule ^(.+)\.htm$ /$1.html [R=301,L]
</IfModule>
Should rewrite any request for .htm to .html, if it doesn't exist, let your 404 display. Windows servers will have an equivalent.