GeorgeK - 7:25 pm on May 14, 2008 (gmt 0) https://www.google.com/adsense/support/bin/answer.py?hl=en&answer=10528
incrediBILL: Unfortunately I don't think all advertising networks even fully support SSL. e.g. see AdSense:
Although you may place the AdSense ad code on a page using Secure Socket Layers, we do not currently offer an https version of the AdSense ad code at this time. Therefore, you may see a message asking for confirmation to load all items on the page when placing the AdSense ad code on secure https pages.