The featured photos is accomplished using the inc-features.php script included with PhotoPost. You can find more information about this integration in our FAQ area:
http://www.photopost.com/members/for...splay.php?f=73
specifically,
PhotoPost Enhanced vB3 Index Integration
The postbit changes are probably discussed on
http://www.photopostdev.com but involve a change to
vB which is not supported here.