Important meta tags for blogger and website owners
1. author name meta tags
<meta name="author" content="author name" />
2. for your site copyright
<meta name="copyright" content="© 2008 Jennifer Kyrnin and About.com" />
3. contact details for the author
<meta name="contact" content="email address" />
4. the date when your content is last modified is very important because google and many search engine prefer new and update content with high quality information.
<meta http-equiv="last-modified" content="YYYY-MM-DD@hh:mm:ss TMZ" />
5. google bot should know what language your site content have so for that we can insert meta tags for language.
<meta http-equiv="content-language" content="en,fr" />
6. if your content is an expiring content one should add an expire meta tag for the same
<meta http-equiv="expires" content="0" />
if this has helped you do share the content with other bloggers and website makers so it might help them in many ways.