Over the years I've read 3 of Barbara Marciniak's books namely, Bringers Of The Dawn, Family Of Light and Path of Empowerment. She very rarely gives public presentations and I can therefore highly recommend this 3 part Q&A session to anyone who is interested in this subject matter. However – if words like channeling, multidimensional reality, energy and frequency give you the heebie-jeebies it's best to skip this one.
One of the many things that I found interesting in this talk is the fact that Ms. Marciniak states (..remember it was 2007 then), that there would be severe water shortages in the United States.
I have no doubt that at the time many people were saying "yeah right, water shortages in one of the most technologically advanced countries in the world". And yet, at the time of this writing and as we speak (2015) the State of California is turning into the Sahara desert as the result of an engineered drought.
If this presentation resonates with you the books will be a great source of additional information.