"
7" colour display that can play videos, images and music and has built in networking and memory card support for $100... Cybermynd"
Add a small flat 12v battery, round and soften the edges and the basis of a cheap ebook device is there. Some of these DPF(digital photo frame)s already display text files which would make JPGbook program unnecessary. And some are larger with 10.4" screen at resolution 800*600. (Even 20.5")
Sure I'd rather have a flexible soft nonreflective eInk device, from a company that I trust not to load damaging files onto my computer, and at a comfortable price. But I think I'll be curling up with a digital photo frame long before then.

And even if I'm wrong that will be great too.