I use this plugin on all of my 40+ WordPress sites. This plugin is extremely useful in so many ways. I use it in combination with a custom CSS plugin and they work very well together.
You can add your company credits in the footer, add advertisements in very various placements. You have complete control of where your content is displayed; for example, you can have content showing up only on the home page, or on tag pages, before or after a post.
I hope to one day see a placement on the homepage, just before and after the post teaser. The plugin also has parameters for BuddyPress sites. It doesn't get anymore customized than that!