It's Greek to Me

" Greek yogurt is strained, so even fat-free versions are thick
and creamy.
And the lost liquid means that the yogurt that's left has twice
the protein of ordinary yogurt (or milk) - about 17 grams in 6 ounces
of plain Greek yogurt. That's not trivial for people who have to cut
back on meat, fish, and poultry.
Many people assume that yogurt is rich in protein because an 8 oz.
container (which used to be typical) of plain yogurt had 8 grams of
protein, just like a glass of milk - and now that yogurt containers
are 4 or 6 ounces - there's less room in the tubs for yogurt, which
means less protein.
A 4 oz. tublet of Breyers Smooth & Creamy, Dannon Light & Fit 60
calorie packs, or Yoplait Fiber One, for example, has just 3 grams of
protein. That makes Greek yogurt even more impressive.
On the downside, Greek yogurt has less calcium than ordinary yogurt.
A 6 oz. container of Dannon All Natural Plain (non-Greek) has 30 percent
of the Daily Value for calcium. Six ounces of Fage or Chobani plain
Greek yogurt have 20 percent. And Greek yogurt is pricier."

-Nutrition Action Healthletter, April 2011