Last week I mentioned an alternative to the forthcoming AdSense
Cost per Action program. It was called Clickbooth.

I've been using it for about a week now and have averaged $1.92
per click and made $488 which is not bad.

Two of the big differences between AdSense and other programs
like Clickbooth are that you can't encourage clicks on AdSense
ads whereas you can on many other types of ad.

Secondly, you can't at the moment place AdSense ads in your
emails.

With Clickbooth you can.