How to choose a domain name?

Every professional business should be keeping up with the demands and needs of its customers, if it is to survive. One of the essential tools of any business these days is to have a professional web site. This begins with choosing and registering a domain name that will clearly identify and brand your business online for many years to come, so you need to choose wisely.
If you want your web site to have an added advantage in the search engines, think of a domain name that includes keywords visitors would search for in the main search engines.
Make a list of all the possible names that would suit your business (i.e. isitebuild.com contains resources for building your own web site or getting one built). Use www.nameboy.com for researching domain names. NameBoy will generate domain names based on the keywords you enter. If the dotcom name you want is not available, create a longer name that describes your business or use names that include hyphens (i.e. ihost-websites.com)
If possible, keep your domain name short so it is easy to spell and easy to remember. Take into account someone may remember the name but forget there is a hyphen in it – you then miss out on those potential customers.
If the dotcom name is not available, try the other new abbreviations such as .BIZ .US,.INFO, .TV. These are not as popular as .COM, however you may get closer to the name you want.

Web Site Domain Name Source