A good domain...

• is short and sharp
• is meaningful -- conveys a clear message
• is easy to spell
• is easy to remember
• is unique, descriptive, and "you"
• is solid, classic, not hokey
• contains your VPP for human visitors
• contains your Site Concept keyword for spider visitors
• is attractive to humans (ex., "anguilla-beaches.com" or "anguilla" is there for the engines and "beaches" is there for humans)
• ends in the classy ".com," ".net" or ".org" (by far, the best regarded by surfers).