I'm kind of curious if any of those search partners are getting the boot from AdSense on June 1, as well as the MFA / Arbitragers, because in some cases, you sure can't tell the difference.
Would love to be able to run placement reports for search partners and have an exclusion tool so that I can choose not to show my ads on some of the partner search engines that I don't think count as true search engines...sorry Google, I don't think that just having a search box on their page qualifies any website that applies to be a search partner. (hint, hint!)