Search Engine Lowdown is sponsored by LookSmart, and in their advertisement post it sounds as though Andy is endorsing their service:

If you want quality traffic at a lower cost than other leading pay-per-click search marketing programs, check out their LookListing service.

I guess quality is a broad word, with many meanings, but from my experiences that post sounds a bit economical with the truth.

Ocassionally I have thought about taking advertisers on this site, but it would take a lot of money for me to say nice things about LookSmart's traffic quality.

If LookSmart believed in their own products would they be displaying AdSense ads on their sites like FindArticles and Zeal? When I just checked even LookSmart itself was serving up AdSense ads.

From your internal testing does LookSmart provide quality traffic cheaper than leading pay-per-click search marketing programs? If their network traffic quality is high then why do they need to outsource their ad sales to Google? In spite of contextual ad click fraud why are some people willing to bid more on AdSense than on LookSmart?