Today you have to add an image in your post in order to show it.
Great if you are writing a blog. But not so great if you are using WordPress as a CMS.
It would be realy great if there was a default feture for relating an image to a post.
Look at my example here: http://www.norwegianfashion.no
I have created a template (frontpage) that lists articles with headline, article abstract and an image.
In order to display the images I have added a custom field to the post called 'relatedImage', and I cut and paste the URL of the image.
Then in the article list, I retrieve the URL from my custom field.