Jay Versluis

Once installed, head over to Appearance – P2 Header Ad and paste your ad code into the box.
Features:
<ul>
<li>preview your ad in the admin interface (see screenshots)</li>
<li>option to hide the ad for logged-in users</li>
<li>option to hide the ad for logged-in WP eMember users</li>
<li>works with and without a header image</li>
<li>option to show the same ad after the post content</li>
</ul>
I’ve optimised the plugin for a 468×80 pixel ad. Other sizes will work but may require your own CSS tweaks to make them look right.

P2 Header Ad

Works just fine! I'll use it for internal important notifications but definitely saved me some time for writing this feature myself :)

Nice!

Places a 468x80 pixel advert inside the header of Automattic's wonderful P2 Theme.

Annika Backstrom

The “Who’s Online” sidebar widget shows a list of recently-active 
blog users. It has been built with Automattic’s <a href="http://p2theme.com/" rel="nofollow ugc">P2 
theme</a> in mind, but does not depend on P2 
functionality.
The most recently active users bubble up to the top. After one week, 
users fall off the bottom of the list and are hidden until they return. 
As of this writing the list does not support live sorting; the user 
order is fixed, and users missing from the list due to inactivity will 
be added to the top if they come online.

Works as expected

Who's reading your P2 blog right now? Keep track.

P2 Header Ad vs Who's Online