I went out today and bought some millet. Apparently, millet is considered one of the world's healthiest foods. According to this site, millet will protect you against asthma, migraine, diabetes type 2, heart attack and cancer. It has a lot of folate, too.
Yet apparently there has been a controversy regarding millet, since many paleo-leaning websites are quick to point out that it is goitrogenic and can interfere with your thyroid function. I did some research and found out that there are several varieties of millet, the most common one used in Africa is called pearl millet and can cause health problems if you consume too much of it while not getting enough iodine in your diet.
On the other hand, the sort available in European countries is called proso millet and is supposed to be quite harmless. I'm not sure which millet sort is most common in the US, but if it's proso, you may want to give it a try. It can be eaten as porridge in the morning or as a substitute for rice during dinner.
Millet is mentioned in the Bible, and some guy on internet swore it helps against grey hair, too:) If you have any experience with millet, feel free to share!