I've posted an article about a simple way of using AdSense Preview Tool to see if a niche will be unprofitable or not. http://adsensespoiler.blogspot.com/2006/04/big-high-paying-keywords-secret.html The article is a bit self-promotional, but if you don't click the link at the very bottom this is pure good information that you can use yourself.
as quickly as they can pump out MFA sites nowdays, I would imagine that's about what it may be coming to - I just can't see how MFA sites make any money advertising on adwords then hoping to make money on the the same keywords through adsense - how can they possibly be successful working the spread like that?
If you look at MFA sites clearly, you'll see that a lot of them resell keywords to Overture. I've talked to a lot of arbitrage folks and they say with Google hiking up prices for AdWords unpredictibly from 5 cents to $5 per click makes Google arbitrage unprofitable but it still works with Overture.
But don't you need to have like xxx,xxx uniques a day to make any deals directly with Overture? How do the domain parking sites get to display Overture results on their parking pages without demonstrating they can send an ungodly amount of traffic their way?
I don't know about that. But as person who advertises with Overture I can tell you my opinion. My impression is that some overture partners found a way to expoit the system and when a person clicks a content link it appears as a "search click". Why do I think that? Because I have content match turned off in Overture, but I get clicks from parked domain sites with Overture ads. Quite a lot of MFA ads contain Overture ads. Some sites contain very strange links, like this one http://www.alltheservices.com/search.aspx?q=Consumer Credit Counseling Services&rd=1&brand= I don't know what PPC engine these ads are from, but I wouldn't be surprised if it's Overture.
I've seen probably several hundred sites over a year that are nothing but a list of overture search results. And since I'm big in affiliate sales, they keep poping up in my referrer logs, but they shouldn't because I have Content Match turned off. I don't know how they do it, but there are a lot of rogue overture "publishers".