I couldn't get on to the contextual ads forum as it just shows a blank page. I was having trouble with ads not showing up and wondered if someone could test the ad code to see if it works your end?
<script type="text/javascript"><!--
google_ad_client = "pub-7541836885363048";
/* 468x60, created 06/06/11 */
google_ad_slot = "2926579883";
google_ad_width = 468;
google_ad_height = 60;
//-->
</script>
<script type="text/javascript"
src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
</script>