I just came across this on the internet and though it was pretty cool:

Steps to building an Infrared Filter for your digital camera

It teaches you how to build a homemade infrared filter for digital cameras with things you can find around your house, although 35mm film is becoming less frequent.

As soon as I can obtain some processed film ends, i’m going to try and make one for my camera. I’ve already been able to confirm that a Canon 10d is capable of seeing infrared through a test I did so I assume the 20d and 30ds can as well.

Related posts:

1. Digital Film (No, Really)
2. Canon 5D Mark II?
3. Yet Another New Canon?
4. Canon 5d Mark II thoughts and analysis
5. Vih-de-oh