Boy does this post ever make me feel better. My hens (8 pullets born last fall at a friend's farm) have been keeping us (and our neighbours, and my parents, and my in-laws) in eggs since we got them at the end of February... 7 eggs a day went down to 4 last Tuesday, then to 3 on Friday. We've held steady at 2 eggs a day ever since.
My neighbour suggested that they might be moulting but I haven't noticed differences in their appearance. I am just happy to read that others are experiencing this too -- which I read as: Normal, don't worry about it. Hopefully my girls will start amping up their productivity soon! At least with two eggs a day we still don't have to go to the grocery store to (gasp) buy eggs!