In this day and age, publishers are always looking for new ways to monetize their content. Ad Overlay Anything for WordPress is a cool plugin that lets you show ads on top of your videos, images, and blocks of text. YouTube videos and Flickr images are supported.
The script is very easy to use. Simply choose a nickname for each block, choose what you would like to display, change text for close button, and the rest is easy. You can also choose how often you would like to display your ads.
Ad Overlay Anything can automatically overlay any HTML element hat you choose. You also get a simple shortcode to target specific elements. Yet another paid CodeCanyon script.