INC.com recently published an article with 10 tips for choosing a domain name. All are pretty good, but this one needs some elaboration:
2. Short and easy to spell — Shorter is better. A short URL is easier to remember and less likely to be misspelled than a long one. For obvious reasons, avoid any domain name that by its nature is hard to spell or confusing.
Not just easy to spell–easy to say on the phone or the radio. I can’t tell you how many times I hear domain names said on the radio, and have no idea how to spell them. If you’re buying radio advertising, include a clear spelling–accents (especially the Pittsburgh-ese in this area) make B and V, M and N difficult to discern.
Full article at http://technology.inc.com/internet/articles/200707/campbell.html.