Proper meta tags are important but are only a small portion to proper organic seo.
Title tag is very important to good seo
Description tag is also important. if you do not have this tag google will pull relevant content from your web page.
Keyword tag: Keyword tag is only used of you have very little content on your page. If your page is robust with content search engines will not use this.
Robots Tag: should be used in every page
Make sure you verify your website with Google and MSN. Go to webmaster tools
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