Ithaca, New York - Culture. 1  Founded in 1983, the Sciencenter, is a non-profit hands-on science museum, accredited by the American Alliance of Museums (AAM) and is a member of the Association of Science-Technology Centers (ASTC) and Association of Childrenâs Museums (ACM).
When substituting sour cream for plain yogurt, or vice versa, it's quite easy: the basic rule of thumb is that you can just use the same amount. This is especially true when you're using it uncooked, like for dips, salad dressings, or baked potatoes.
I find creme fraiche to have more of a cream taste. Over on this other thread, we've been talking about CF vs. sour cream and recently several of us have posted about making one's own creme fraiche: http://www.chowhound.com/topics/462753. As chowser noted, it's probably like any other cream, sour cream, butter, etc. in terms of fat content etc.