HI,

I had tried to covered all possible points which one domain name have. please add if i miss something.

# Memorable: Names with special characters like hyphens and underbars are harder to describe to customers over the phone. Visitors aren't as used to them either and you may inadvertently send customers to your competitors if they have similar names without special characters!
# Descriptive: Use your company name or a description of your product instead of company initials. People would instantly know what a site called "Stumble Upon" is about (although they might be suspicious). The full title is much more descriptive than the acronym "SU."
# Short: The maximum allowed size is 63 characters, but keep the name as short a possible. That's easier to type and remember.