There's also this mambot: extensions.joomla.org/component/option,com_mtree/task,viewlink/link_id,26/Itemid,35/ I haven't tested it with 1.5 but I have it running on my 1.0 joomla site.
You can call any module in the article with mambot command {mosloadposition modulename}. Example: make a module ie advert1 with your adsense code in it, than called the module in the article with {mosloadposition advert1}.