I talked yesterday over at BizPlanHacks about getting customers through your company website. Do you have a company website? You should.
SimplWeb has an online course available to help you start a website. They describe it as "a free 7 part guide to creating a killer content site that can make your business more successful." And it looks pretty acceptable.
If you decide you want a vompany blog as part of the website, the Blog Herald has a free seven-day course on business blogging. Upi may also want to look at YOUmozBlog, which has a piece on the "seven deadly sins" of company blogging.