http://www.threadwatch.org/node/6110 - included is a response from Google when questioned about Oingo:
I understand that you're concerned that your ads may be appearing on [Google-owned-parking service].com even though you've added this URL to the site exclusion tool. [Google-owned-parking service].com is part of the Adsense for Domains networks and although most of these sites may be excluded with the site exclusion tool there are some exceptions that may not. This is due to the fact that some of these sites are of a hybrid type and are considered both part of the search and the content network. Oingo is one of these exceptions. To learn about the difference between the search and the content network please visit https://adwords.google.com/support/bin/answer.py?answer=6119&hl=en.
To effectively filter your ads from this site you may want to consider opting certain campaigns out of the search network.
If you opt out of the search network, your ad will no longer appear on your unwanted site, nor will it appear on any other site in the search network. However, opting out of the search network may significantly reduce your ad coverage and visibility to prospects.
I have known for some time that Google has owned this company and that it involved parked domains, but it just hit me as to just how serious a conflict of interest we have here folks. The fact that they consider traffic from these domains to be "search" means that we not only pay the search rate for this traffic, but that we also can't opt out of traffic from these sites unless we drop the entire search network which include AOL and Ask.com.
The other aspect of this that is really compelling is that Google is now penalizing sites for having "thin" content by incorporating a landing page quality score into PPC campaigns. So on one side you have sites penalized for lack of real content, yet Google is rewarding these same sites by giving them a cut of the search revenue and by preventing advertisers from eliminating these sites from their campaigns.
Some examples of actual domains I found:
Thanks to Steve and Vinny for sparking the discussion during the last Affiliate Summit.