I'm getting thoroughly tired of fielding e-mails and hard-copy from
domain resellers trying to scare my clients. The latest one, in hard
copy from Domain Names Australia, tells my client that his "xxxx.com
domain name is 'unregistered'. It is important to have your .com and
.com.au domains registered ..." It goes on to say that "Failure to
register the domain may: (blah blah)". 
On first reading my clients could be tricked into thinking that their
domain is again up for renewal, so they send off the form and lo and
behold they're the proud, and probably unnecessary, holder of a .com and
a .com.au domain name.
I abhor scare marketing and, for this reason intercept most of my
clients' DNS-related mail so that I then don't have to field ten calls a
day on the subject.
Perhaps DNA and other resellers should agree on a code of ethics whereby
the letter becomes an invitation rather than "the sky is falling".
David James