We have never tied Christmas into being good or bad. That's right, no "Santa's watching" types of comments.
My kids, like most kids, are basically good most of the time. Sure, it gets a little crazy around Christmas time. So parents (and teachers and babysitters and everyone else) need a little more patience.
But I could never understand translating that excitement into a threat that you won't get the stuff you want.
That said, my kids have always understood that their lists were "suggestions" for Santa. Like any gifts, the giver gives you what he or she thinks you'll like. (That's part of the reason I hate bridal and baby registries, but that's a different topic.)
The stuff you WANT, you save up for. The gifts you get, you appreciate.
My daughter was saying the other day that some of the Christmas gifts she's loved the most have been the ones she didn't ask for.
Of the BIG gifts this year, I'm most excited about the Kinect we're giving our son and the Kindle my husband is getting. Both should be total surprises. (The girls asked for, and are getting, an American Girl doll. Though my younger daughter asked for another Bitty baby, and is getting Molly.)
Christmas is NOT about placing orders and having Santa fill them; he's not the UPS guy.
Oh, and all 3 of my kids (and most of my students-- I teach high school) DID write out lists. I'm bringing them to Macys today for their Make a Wish promo. (Macys will donate $1 a letter to the Make a Wish Foundation.) I promised my students that I wouldn't read their lists, but I can only imagine what some of them said