I've noticed it a lot more lately. And if its not written directly on the menu there is a small pamphlet or book on the table somewhere.
I've seen this done at chili's, applebees (it's a seperate nutrition menu on your table- LOVE IT!), Denny's has one also, and so on.
I think it's AWESOME! For me I look for low carb options and last time I went to applebees got the california shrimp salad- it was perfect, 860 calories but only 26 grams of carbs.

That might be a little high for some low carbers but it was good enough for me
