It's Short
The shorter the name, the easier it is to say,
remember, spell, and type. The exception to this rule are well-known
phrases, which can be quite long and still hold significant value.
For instance, 'ForSaleByOwner.com' sold for over $800,000.
It Passes The 'Radio Test'
If a name is heard on the radio, would the average
Net user be able to remember it, and then type it into a Web
browser? If so, it's probably a good name. This means that using
deliberate misspellings, shortened versions of words, or numbers,
generally reduces the value of a name.
It's a Dot Com
Some specific dot net and dot org addresses are
valuable, particularly one word names, but the most popular for now
and the foreseeable future is dot coms.
It Will Have A Large Degree Of 'Uniqueness'
Think of the pool of domain names as a pyramid,
each brick being an individual name. At the top of the pyramid are
the one-word names, then you move down a level to the
two-word names, and the further down you go, the more words in each
name. At the base of the pyramid, where the names approach
sixty-three characters in length, there could be ten or more words
in each name.
As with any pyramid, the further down you go, the
more bricks there are on each level, and for this particular
pyramid, the bottom row contains an almost infinite number of
bricks.