Several of the major search engines rank web sites much higher if the search terms are contained in the domain name. You can use up to 63 characters to create a long domain name with keywords and automatically redirect visitors to the real web site. Some registrars offer the redirect service as standard in their price. DO use the appropriate pluralization. DO use words that can be visualized.
Vision is the strongest of human senses.
Even better, use words that involve several of the 5 senses. DO plan for the future. If you are planning on releasing other products or services from this domain name in the future then don't limit the relevance to the initial product or service. That being said Internet marketing experts believe that your web site should have only one subject or focus. All products or services listed on the web site should be related.