The Easiest Way, by Mabel Katz, is a simpler explanation of ho'oponopono than the more complex version of it introduced in Zero Limits. Mabel became a student of Dr. Hew Len more than ten years ago and these days is one of its premiere teachers. She does phone seminars, and has two websites. One, I believe is MabelKatz.com and the other is already linked here and called businessbyyou.
For readers of Zero Limits, The Easiet Way introduces 3 more cleaning phrases. Anyway, it's a quick read and well worth perusing if you want to take 100% responsibility for everything in your life.