So what should we do about Domain Names, URLs and what are they?
Wikipedia’s entry on Domain Names says this:
Domain Name Optimization
Use keywords as part of the domain name where possible. Purchase other domain extensions to protect the brand. Buy the .net, .org, .us, and other extensions so competitors do not. Keep URLs concise & descriptive. And ensure that the user should be able to determine where he is based on the URL.
What I suggest is that you look at this article: How to Choose Domain Names for SEO.
Now get out there and optimize your domain names, master of your SEO domain!