Shak - 6:41 pm on Sep 7, 2003 (gmt 0)

3 possible reasons.

1, Have you requested Google to show your ads on partner network, or rather have you opted out?

2, Are your ads hitting a high enough CTR to be passed over to the partner network.

3, Have your ads been editorially approved, which is the case before passing across the network?

Shak