Most of the domain names are already taken. For the .com .net and .org, the first ones to appear, any combination of 6 or less characters is nearly gone… so you either buy in the resell market or you use one of the latest released such as .cc or .co or country base such .ly , .es etc…
A great tool to add creativity to your domains is domai.nr
Domainr helps you explore the entire domain name space beyond the ubiquitous—and crowded—.com, .net and .org. Inspired by jish.nu, burri.toand del.icio.us, apologies to Flickr, and a high-five to Dopplr.
Read more about their features.