This is a very brief and very far from exhaustive list of sources one ought to avoid when looking for any sort of scientific information. After each person and/or organization is a list of the area in which they most commonly spread lies:
Deepak Chopra – Quantum physics, alternative medicine
NaturalNews.com/Mike Adams – Alternative medicine, vaccines
EvolutionNews.org – Evolution, intelligent design
Dr. Oz – Alternative medicine, apple juice
Andreas Moritz (though he is now deceased) – Cancer, HIV/AIDS, Diabetes, all around quack
WattsUpWithThat/Anthony Watts – Global warming
Dr. Keith Ablow – Psychiatry, youth psychology, gender issues
Stanislaw Burzynski/Burzynski Clinic – Cancer, quack treatments
Marc Stephens – Mostly law, but he lied about being a lawyer in order to try and protect the Burzynski Clinic
Nothing But Science 