The following is a list of different sections that you may want to consider writing content for. This is just a guide, every site is going to have different needs!
This page or set of pages should describe exactly what you do, what you offer (just an overview, see descriptions of products below), and your point of difference. You may also want to write about the history of your product or company.
Information about getting in touch with your company, and where to find you. If you have retail outlets you might want to list them.
Descriptions of your products and services, specifically and in detail. If people can't find enough information here to help them make a decision they may well move on to a competitor's site that can.
People like to know who they are dealing with, especially if you are a service oriented company.
Consider sections on media mentions, news about your company or industry, press releases etc.
You may want somewhere to announce upcoming events or new products. If there is a lot of this you may even want to consider having a calendar that people can look at. For smaller sites you can combine this with Recent Business Activities under the heading 'News'.
Increase your credibility by showing proof of recognition from your customers and/or peers.
Mostly only applies to service oriented businesses. Prove your ability by showing what you've done.
Show you're an expert at what you do, drive traffic, increase search engine rankings
If you want to have a section specifically for links, make sure that they are useful and relevant. Search engines don't like too many links that have nothing to do with your site.
Your website is a good place to advertise upcoming positions. Some companies don't advertise specific positions but use this section to allow people to express their interest in working for the company instead.