Meta Tags are used to help specify a Web page's description, keywords, language and other important information to search engines and the human visitor.
A List of useful SEO sites where you can learn how to harness the power of google :
Marketing Pilgrim
Search Engine Watch
Get Elastic
Courtney Tuttle
The Keyword Academy
Grizzly's Online Blog
Search Engine Land
Daily Blog Tips
Web Analytics World
BlogStorm
Small Business SEM
SEO Scoop
Search Engine Roundtable
Daily Blog Tips
Matt Cutts: Gadgets, Google, and SEO
SEOmoz
Search Engine Journal
Pronet Advertising
Search Engine Guide
Online Marketing Blog
eBusinessIndya.com Links
List Of Sites to SUBMIT FREE Search Engine Submission
Aesop.com
Anoox
Burf.com
Changing Links
Entireweb.com
ExactSeek
Exalead
Google Network
Jayde Online
Scrub The Web