I know it's low-tech, but I just keep a pad of sticky notes in my laptop bag. If I write a note, I can stick it to the screen when I close the laptop, and it's

I know it's low-tech, but I just keep a pad of sticky notes in my laptop bag. If I write a note, I can stick it to the screen when I close the laptop, and it's there to remind me when I get back to the office. And my cousin is a sales rep for a drug company, so I have a whole crate of logo-ed sticky notes.