I'm really pleased to see you doing this, Thane of Fife. I enjoyed your OGB thread. Subscribed!
I must admit, I also see FR Adventures as an intergral part of the revised CS. Let's see if our enthusiasm for this thread sees Thane of Fife continue on to that book also....I remember 3 sections of interest for that book: specialty priests + costumes, spell translations from the old gray box into 2nd ed with additions, and descriptions (with maps and npcs) of all the major cities of the heartlands. I spent many an evening pouring over the cities trying to figure out the demography of levels in forgotten realms and probably min-maxing the specialty priests.
So if you really want to go into religious and geographic details it's better than the gray box.