Frequently Asked Questions (FAQs) when done correctly can not only save you time by dealing with customer queries before they even pick up the phone, but can also be used by your sales staff to answer questions in a uniform company regulated way.

example 1: Water @ Work (comprehensive list of FAQs)
example 2: BraveheartScotland.com (sub section of the site that deals with casting arm of the organisation)
example 3: Enforcer Security (all you wanted to know about broadband)