Typically H1 tags are reserved for page headings, i.e. on a blog post the blog post title is very often the pages H1, or top-level heading as the W3C puts it.

On the SEOmoz home page they currently have "SEO Software." as their H1 tag, which seems perfectly reasonable and to me fits the W3C criteria.

However, what if the primary keyword for SEOmoz was "seo community" so they decided to wrap just those two words in the sentence that follows on their home page and maintain the existing style of the words "seo community" with CSS. (see attachment)

Are there any arguments against doing that?

Would Google be able to detect this? If so, would Google care?

I do believe the overall importance of the H1 tag has lessened to a degree, however I still believe they are valuable to an extent and would love to hear anyone's thoughts.

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Hey Steve,

As Ryan mentioned the keyword meta tag is no longer used for ranking purposes. Here's a great Google Webmaster Post and video with Mat Cutts that covers this topic.

As for your keywords I would stick to 2 or 3 per page so that the page is targeted and tightly themed. If you try to optimize your pages for too many keywords the content will likely start to become diluted and less valuable from a search engines perspective. To answer your second question more directly it would be ideal to have individual pages that target a single keyword, however I would only recommend this if you have quality content to support each of the keywords. Otherwise, your pages will have a difficult time ranking.

Something to note is that a few of your keywords are multi-purpose. In other words, if you optimize one of your pages for "digital aerials stockport" you will naturally be optimizing for "aerials stockport" as this keyword is contained within "digital aerials stockport." Just something to think about

If you're looking for some tips on keyword research check out this section of the SEOmoz Beginners Guide to SEO.

Hopefully this helps - good luck!