I have observing strange adsense ads on my site Google Adsense Text Ads Without Title Links and Google Adsense Image Ads Without "Ads by Google" Anyone else seeing similar ads?
http://www.jensense.com/archives/2006/07/unbranded_adsen.html They have been testing ad units without Ads by Google for a few months now. The title links issue is usually related to an adblocking issue or having certain URLs added into the restricted site settings in your browser settings. But Google has had issues in the past where it has been an ad serving issue.