I grew up in a packrat's house, and I couldn't stand it.
I hate having things around that I have no need for. I throw out stuff all the time. I'm so good at it that I would be a garbage man if it brought a decent paycheck. Ok maybe not, but you get the picture.
When I go through my junk, whether it's my junk drawer or my whole garage, I use the following criteria:
1) Have I used this item in the past year, and do I honestly foresee myself using it in the next year?
2) Does this item have sentimental or significant monetary value?
3) Is this item a receipt or legal document that I have to keep?
If I cannot answer yes to any of the above questions, it is either given away or put in the circular file.