There are a few domains that most anyone would be familiar with.
Stop and think of two or three that you know because you have seen them
advertised somewhere. Are they short? What is the longest name
you can think of that someone else would know if you told them of it.
When I ask someone to name a dotcom name, the name that almost always
pops up is Amazon.com. Keep in mind that Amazon spent well over
$10 million to brand that name. Chances are that any name that you remember
has had massive advertising, or is a company name that you know or is
very descriptive of the business in mind.
Like amazon.com, a memorable name may or may not have anything to do
with what you sell. Memorable and catchy domains are very closely
related. They both require advertising to let people know that you are
open for business.
Once you get your name known, it is wise to make many business alliances
and trade banners and advertisements. This will help to ensure
that nobody forgets your name forcing you to pay for a public advertising
theme again.