Business week has an EXCELLENT article on a business that is producing a very successful newsletter. The article reads It arrives via e-mail once a month, not another dull corporate intrusion or obnoxious exercise in self-promotion, but a colorful diversion capped with a guaranteed chuckle. No, we’re not talking about a humor column: We’re talking about spam. But not just any spam — it’s Rigney Graphics-brand Spam, which originates from a 13-employee graphic design firm in Glendale, Calif. The humorous, often tongue-in-cheek e-newsletter is not only bringing in new business, it’s attracting subscribers of its own, says business owner Bruce Rigney.