I would love to have this kind of adsense control on my sites. I wonder why it is not open for most publishers who earn more than x k/month. Probably they look for traffic numbers and not for adsense income?
This way you could 100% target the ads appearing on each URL. In this case even the descriptions are clickable.
<script type="text/javascript">
var googleAdIframeTable = [['googleAdUnitIframe_top', 8]];
var googleAdClient = "";
var googleAdChannel = "";
var googleAdSearchQueryString = "business";
var googleAdFrameborder = '0';
var googleAdColorDiv = 'FFFF99';
var googleAdColorBg = 'FFFF99';
var googleAdColorLink = '0000CC';
var googleAdColorVLink = '0000CC';
var googleAdColorALink = '0000CC';
var googleAdColorText = '000000';
var googleAdColorAltText = '008000';
// The following parameter is optional:
var googleAdAlternateAdUrl = "http://www.example.com/googleafstop.shtml?q=Chiropractic";
</script>