I got this idea from a commercial product which had the IR mounted on the end of a retractable telescopic pointer.
[youtube]http://www.youtube.com/watch?v=B4ccysJXhZ4[/youtube]
I have used the wiimote whiteboard in my classroom for over half the school year now and have noticed that:
- students have trouble triangulated themselves outside of the camera and the IR LED
- students don't hold the pen in a favorable angle for IR detection
So, I see the AV Rover people have thought of this in their design, thus the telescopic mount.
Now I have a telescopic pointer, but I was not willing to sacrifice it, so I just used a wooden dowel rod mounted in the now infamous dry erase marker.
This is my 3rd custom pen, and I will say probably the best yet. I made two types, a short for writing, and a long for mostly pointing and easy annotations.
Here it is all apart:

I got tired of buying double AAA battery housings and having to cut them in half so I just made my own from some extra "chromosome" popsicle sticks with some old electronics battery connections

Here are the momentary switches that I have been using, in the past I have mounted a popsicle stick over top which make it easier to engage.

The dowel rod had the LED mounted at the end which is partially split down the center so the + and - IR LED leads fit in. This one I put electrical tape all the way down.

Final version?

Here is the longer "pointer" version

Getting fancy with the wires

Momentary switch hot clued into place for perfect anatomical usage
