A Blog can not only earn money from Adsense. Many services are rising up these days. So many of them, that it is hard to keep track.

The best review I have found in the last weeks can be found here

http://www.ewriting.pamil-visions.com/2007/05/23/paid-blogging/

http://www.blogitive.com/

http://sponsoredreviews.com/

http://www.blogsvertise.com/

http://contextual.v7n.com/

http://www.smorty.com/

http://www.bloggerwave.com/

http://www.reviewme.com/index.php