Over at Copyblogger, there is a great post analyzing how you should end an article. Many people, especially Brian, from Copyblogger, concentrate on starting a post, as well as the main content, but people should also give the ending a fair amount of thought because many times, the ending is what people remember the most, or what they act/re-act on.
He gives some ideas on ending an article:
2. Call to action
4. Post Script
Of course he goes over in detail what each of these mean, and how they can help you “close like a champ” as he puts it, so you will have to check out his article at Copyblogger.