I think they are referring to marketing collateral here. And while I don't like to use Wikipedia as an inscrutable source (must be feeling lazy), here's the definition:

"Marketing collateral, in sales, is the collection of media used to support the sales of a product or service. These sales aids are intended to make the salesperson's job easier and more effective. Common examples include:

Sales brochures and other printed product information
Posters and signs
Visual aids used in sales presentations
Web content
Sales scripts
Demonstration scripts
It differs from advertising in that it is used later in the sales cycle, usually when a prospective purchaser has been identified and sales staff are making contact with them."

Selon le contexte, j'ajouterais "externes."


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Note added at 1 hr (2006-05-09 16:35:14 GMT)
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Yikes. I'm blushing. IF you read the explanation, please replace "inscrutable" with "authoritative."