Does anyone know of any projects to hack together an external E-ink display for reading documents? I will honestly print PDFs out to read them sometimes, and I would love to be able to drag big legal documents onto an e-ink screen to read.

But I don't need a whole new monitor, and this Philips display seems way expensive relative to the cost of the individual e-ink panel.

Edit: Thank you, everyone, for the recommendations - for the fun of the project I might give this a try, but I guess I can also see why this hasn't become popular yet. For the money I can print out a lot of PDFs...and take a color highlighter to them.