I run a Web Design Company in Michigan and I use Google Webmaster tools for all kinds of useful stuff. Monitoring backlinks to my website, checking for duplicated title tags and meta descriptions, and making sure I have no broken links floating around in Google's Index and if I do have broken links, they have a cool tool to remove them!
I also recommend Google Webmaster Tools to every one of my clients and teach them how to use it so they can get the same awesome results that I do.
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abirhasan 
