If you are of the modding sort, you can pick up a cheap netbook somewhere and install the Pixel Qi display:
link
This would be similar to the edge in that it offers both a color and e-ink option, and with some of the custom cases for netbooks that let it fold over itself its pretty neat. Though of course this will cost a lot more money than just buying an EE or PE itself, and people have said that the e-ink isn't quite the best. You also lose some multitasking ability due to it being a single screen.
I was almost contemplating doing this despite all that, until I saw the PE, and given the price difference it really wasn't that hard of a choice to make.