1. Must be a dot com.
2. Must clearly state & define the product or service being sold.
3. Must be easy to pronounce & therefore pass the radio test.
4. Must not be longer than necessary, the shorter the better.
5. Must be about a product or service that is in demand & being searched for.
6. Must be easy to remember, in fact it must be a no brainer to remember.
7. Must be a domain a business could be built on.
source: http://www.ricksblog.com/my_weblog/2012/11/ringscom-roofscom...