As name says, thin strong lightweight translucent paper, write anything on me and traces of it will remain with me, long after you have rubbed it out.
http://www.glowpaint.com.au/
http://blogs.msdn.com/b/jmeier/archive/2012/01/07/10-things-great-managers-do.aspx?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+jmeier+%28J.D.+Meier%27s+Blog%29
http://www.barnesandnoble.com/p/nook-color-barnes-noble/1100437663#nook-commentary-features-1