There have been other posts about this and varied responses and opinions. Personally, I do a journal...it's just a small memo pad for each child. I simply write, morning snack, lunch, naptime, afternoon snack. And since I'm not organized enough to have a weekly menu, I write what's for lunch tomorrow. If the child is potty training, I might jot down how/when.... or anything cute, funny or bad even . But on a day to day it's just food and naps. A lot of people say they don't have time, but seriously, the way I do it it takes no time at all. While they're at the table, I quickly jot it down....like one minute, maybe....
It's basically just what I'd want to know as a parent and sometimes it's difficult to talk at pickup...that and I have a TERRIBLE memory!