GoogleGuy explains reasons why people should use "google" in the domain name for 'for-profit' businesses.
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dirkz, I'm pretty biased on this one, but I've seen a few people register for-profit businesses with "google" in the domain, and I personally think it's kinda rude. I also see emails when confused users believe that googlewhatever.com is associated with Google. It causes unhappy users, confusion, etc. etc. My personal advice would be just to grab a different domain name and write to people that link to the old domain and ask them to change their links.