Jakob Nielsen is still churning out Alertbox, his e-newsletter on Web usability… after 9 years. This is one of those oldies-but-goodies you should definitely be reading. This week’s issue talks about linking directly – and obviously – to related products from informational articles. As Nielsen puts it, “Don’t just chummy it up with your customers… explicitly ask them to buy your product.” Specific tips on how to do this are in an article I wrote for WordBiz Report: 5 tips to make your e-newsletter sell. It’s based on an interview I did with publicity expert Joan Stewart, aka the Publicity Hound. The secret to selling with content? Equate your product with a problem that your reader/customer has. Then pair a low-key promotion (“Want to learn more?”) for that product with an article on the problem.