Post-its – the greatest invention of all time! I literally stick them on every thing that is laid out to tell what goes where or what goes into which dish, etc. They make great low- fi tabs for seating arrangements and much more!
Preach it, Danielle.
As anyone who has been at my house in the hours (or sometimes, let's be honest, minutes) leading up to a party can tell you, post-it notes are my best friend. Not counting Excel spreadsheet timelines, that is. I use them exactly how she suggests, too. There is nothing like a post-it to help lay out a buffet.