Santa was very good to my kids this year, which was great...but also means we have a bunch of new toys to find room for in our small and crowded house. We've started a new tradition in the few days after Christmas, which we call The Big Winnow.
What that means is we have the kids go through all their old toys and books and decide what to donate, and what should just be pitched (fast food meal toys, random pieces of stuff that belong to toys long gone, etc.). My daughter (8 years old) did a great job....my son (4 years old) needed a little encouragement. But the upside is that we now have tons of space for all the new toys, and a good idea of what we might need to get to store everything neatly (so....many....Legos). Clearing out old toys also means that these new ones won't end up forgotten in an overfilled basket or bin and are easy for the kids to get to on their own. And everything has a place, which makes cleanup faster.
Some people think kids should have the final say over what stays and what goes; other people (me!) think parents should. I've had too many experiences of trying to reason with a kid who insists that a toy he hasn't touched in six months is his favorite in all the world to allow them final say, although since my daughter is older, she gets a little more latitude.
Do you do a post-Christmas purge? Who decides what stays and what goes?