Heather, that's a great idea to write it on a slip of paper! We could walk around the house with fluorescent colored post-its all over ourselves! I love it!
Also, my DH found an article recently that confirms what we've always thought, that we leave the word for what we want in the room we were in we thought of it. As in, I'm in the kitchen and think of something I need to do in the bedroom, I go to the bedroom and haven't a clue WHY!

I go back to the kitchen and I remember what I wanted in the bedroom!
Anyone familiar with that?