I’ve just released a quick update for my P2 Header Ad plugin for WordPress: http://wordpress.org/plugins/p2-header-ad/
I’ve added a tickbox which allows you do disable the add for logged-in users so the ad will only be shown to visitors.
The release is also available on GitHub: https://github.com/versluis/P2-Header-Ad
Here’s a quick peek at the admin interface:
