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Meta Keywords in Body Content
For all you search engine optimizers, the Search Engine Roundtable talks about whether or not there is a penalty for using META keywords that don't appear in the body of your page. Interesting topic and one that I hadn't thought much about recently.
The consensus on the forums is that as long as you are on topic that this won't cause any type of penalty. However, when you think about the way crawlers are written and the lack of human intervention, I almost think that this conclusion is incorrect. I believe it would be prudent not to use keywords that don't exist in your body's content and to make a concerted effort to make sure you have 100% inclusion.