Already did it worked great. (except that there were about 9000 layers). I used Dans expression as the position and your expression as the anchor point.
To make the 3d pins I used a 30 by 30 grid which is 900 layers and applied the animation. Then I took that comp and used the usual ‘multiple layers in Z space technique’ to extrude them. I also put a simple choker on all of the extrusion layers to create actual pins with heads.
http://www.brownsugarstudios.com/files/AE/pin.aep
It took 35 minutes to render 6 seconds though. Ugh.
If you go to the text comp (not called that) you could replace it with footage and use the Set Matte based luminance instead. Lastly, you only have about a 300X300 space to work with even though the comp is larger. I put in an adjustment layer that prevents you from going outside the boundry area.