A good rule of thumb for a domain name is "what you say is what you
get". For instance,
supposing your web address is something like "www.two-for-1-4-2day.com"
Just how do you tell
people in a conversation without having to go to great lengths in
deciphering it for them? When you have
to explain if the name is made up of numerals (i.e. "4" instead of
"four" or
"for"), then that's not really an ideal name. The ideal name is "as it
sounds",
no need for interpretation or explanation. No hyphens or "numerals for
words" substitutions,
just a plain how it sounds name that is easy to recall.