What do you know about weatherizing?

Now that the temperatures are getting colder, it's time to find and seal those air leaks in your home.

What has your experience been with weatherizing? Have you come across good resources that you'd like to share with the cool crowd? Do you have products you'd recommend? Know of techniques that did or didn't work? We're curious to know your thoughts on the subject.

There's also more information and links on the ImCool.info site under the "Weatherize your doors and windows" action.