My main website, Pangea Enterprises, uses the popular CMS MODx. Although it has many greatly applaudible features; the one thing I think it is let down by is its lack of support for showing, or at least being able to insert Adsense ads unsing the admin WYSIWYG.
A suggestion to anyone seriously thinking about writing a CMS would be to look at what clients are likely to include, such as Adsense ads, and make it easy for them to do so.
I currently have to go through the source code of all my site posts to be able to put in my ads code - something that gets tedious after a while!
Not whishing to complain about everyhting and anything in this post, I’ll leave on a bright note: MODx is one of the BEST CMS Ive evey utilised, and is one I suggest to all my clients for any need, as it is so easy to use (apart from with adsense!!!)

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I’m pretty sure you CMS
I’m pretty sure you CMS uses a template system so you only have to edit the source of your template and put in your adsense code here once and for all. Try looking for the template system on your CMS or at least for two files nammed header and footer..