What kind of domain names are the best?

When choosing a domain name it is very important to try to keep it as short as possible.  If you can come up with something catchy that is always good and it is also good to include your main keyword in the domain name.  Some people say that domain names are making a transition from domains with keywords in them to domains that you can brand, for example, Google.  For our purposes, keep your domain short and put your main keyword in your domain.