Plugin: Advertisement Mgr.
This plugin should seamlessly allow the blogger to add varying sized banners, adwords scripts (or something similar) to the typical areas found on a blog. Near the header, near the footer, the right/left nav and an inline ad within a particular blog post.
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Paul Klinkenberg commented
Even though it does 1/5th of what is wanted, I created an adsense plugin which can display ads on your site: http://www.coldfusiondeveloper.nl/post.cfm/mangoblog-plugin-adsense-ads-on-your-blog
As Adam already mentioned, it is too bad people who want to use the plugin need to edit their template files. Maybe that is the actual question: "add events to a lot of extra places in the templates"!
Though it's not perfect, I used SideNote to inject ads into my sidebar. If you modify your template, you can inject those ads anywhere in your theme that you need. Take a look at it here: http://www.visual28.com/articles/sidenote
The problem with this idea is that there are not events broadcast at these locations, so it would require modifying your skin.