WP Theming has a terrific audience of WordPress developers and enthusiasts. The site gets 50k+ page views and 30k+ unique visitors per month. One or two new posts are published every month.
If you’d like to support the site and promote something in the WordPress space, there is currently one ad slot available in the right sidebar (where the “Featured Theme” currently is). Pricing is $250/mo for an image + brief promo text. WordPress products must be GPL if applicable.
I’ve done some testing, and ads with an image generally get between 150-300 clicks per month. You’d be responsible for tracking performance and results may vary of course.
If interested, get in touch.