Via Watershed Studio:

Now through April 30th, 2011 you can purchase OIOpublisher (affiliate link) for just $37 (normally $47) by using coupon code “SPRING11-WSHED” (no quotes).

If you’re unfamiliar with OIOpublisher, it is a PHP based ad platform with a focus on performance, control and ease of use. It allows you to easily serve advertising on your blog or website and keep 100% of the revenue you bring in. For those of you using WordPress, it includes a plugin that allows for easy integration. And if you need consulting help setting it up, please contact us.