rock_nj and MyFavoriteBedding , this page should explain you something about Panda update: http://www.webanswers.com/_clrc0hdv/technology-com...
The post is from WebAnswers which is also a Google AdSense revenue sharing website (60%). It is an awesome question-answer website where you can earn money by asking and answering questions.
Making a living off of HubPages is possible but not easy. As far as I "forecast", it takes at least 100 quality, original, well researched and insightful hubs to make money so as to replace you day job. HubPages also does not recommend anyone to quit their day job and write hubs. HubPages earnings are simply supplement to your income. While you can make living off of it, its not guaranteed and easy.
The main thing to remember here is about AdSense. A tiny mistake and your account is gone. Don't put all your eggs in a single basket. Grow your blogs and websites while also writing for HubPages. Write for other websites which pay via Chitika, Infolinks or even direct methods like Check. Write for eHow and about (dot) com.