I think the views404 module should definitely be in the checklist if you use a lot of views.
http://drupal.org/project/views404

This will prevent a lot of duplicate content.

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Ben Finklea’s picture

Ben Finklea CreditAttribution: Ben Finklea commented
Status: Active » Closed (won't fix)

Get a full release of Views 404 and we will consider adding it. Generally, we don't include beta modules. (We've made some huge exceptions for D7.) Great idea for a module, btw. Thanks!