as for the ad code, this is how it is supposed to work:
[11/3/2008 5:51:04 PM] S. Ruijsenaars says: for all pages that are not environment or energy:

alternate:

1.

2.

[11/3/2008 5:51:15 PM] S. Ruijsenaars says: for the first 150.000 views
[11/3/2008 5:51:39 PM] S. Ruijsenaars says: afterwards, show

[11/3/2008 5:52:34 PM] S. Ruijsenaars says: for the first 75.000 environment and energy views each month:
[11/3/2008 5:53:25 PM] S. Ruijsenaars says: alternate:

1.

2.

[11/3/2008 5:53:41 PM] S. Ruijsenaars says: after that, burst
[11/3/2008 5:54:21 PM] S. Ruijsenaars says: environment/energy ads have shown 3082 times since nov 1
[11/3/2008 5:55:34 PM] S. Ruijsenaars says: and countBP wasnt being reset every month. 

that code was in header.php.inc, in case you wondered