I still think that sites like "ebay" or "facebook" (granted that had some small significance to Harvard students) or "craigslist" or "etsy" or "google" or "skyp

I still think that sites like "ebay" or "facebook" (granted that had some small significance to Harvard students) or "craigslist" or "etsy" or "google" or "skype" (though that is more oriented as a client software) prove that the win is in the product itself and the positioning. xkcd is another example, though not every geek necessarily loves xkcd. A good domain name DOES help people understand what your product is about, but it is not the absolute make or break success criteria that so many people seem to think it is.