> please excuse this intrusion into your mail box
It is regarded as good manners to ask first before spamming mailing
lists with an advertisement or announcement.
Why would the readers of TYPO-L, a list about typography, or SGMLIE-L,
a list about SGML, be interested in your catalogue? What typographic or
SGML software do you include? Can you mention something specific?
The fact that your address block doesn't include an email address tends
to indicate that you're new to the Internet. It might be more
productive to learn something more about network etiquette and the use
of the Internet for commerce before jumping in like this.
PS shameless plug: my book about the Web has a whole section on this.