This is where I first learned you could do this:
Step 1: Open it up
The two halves will come apart and out drops the circuit board with wire/etc attached.
Step 2: Unscrew the lense assembly
I'm not sure but I think maybe the CCD can be harmed if you shine bright light directly at it (without a lense assembly in front of it) so I hid it away under a piece of paper while doing the rest of the steps.
Pull the lense assembly out from the surrounding knobby thing (the blue ring that you turn to adjust the focus)
Step 3: Get in there
To pry all of these away without snapping the lense would not be easy, so I filed away on a side where the threading is to have access to the edges of all the layers (lense, plastic thingy, etc).
Step 4: Pry everything apart
I did this very slowly and carefully as I had heard horror stories of people cracking their lense in half.
Step 5: Yank out the IR filter
Then pop all the layers back on (make sure that thin black circle thing isn't blocking the lense). everything popped back together securely so I didn't use glue or anything.
Then put the lense assembly back into the blue ring thing and screw the whole thing back ontop of the CCD. Screw back the case, you're done.
Step 6: Test it out
Try not to use this for anything creepy.