A competing firm cries foul over the Nook's color touchscreen. Did Barnes & Noble steal their idea?

The two e-readers above share one glaring similarity: The color touchscreen on the bottom, which allows you to navigate the books and content that you pull up, on the big black-and-white screen above.

And yet one--the Barnes & Noble Nook--has been widely hyped, while the other, the Alex Dual Screen eBook Reader, got lost in the shuffle. As we first suggested, the uncanny similarities hinted that the two companies were on a collision course.

The crash has arrived: Spring Design, the company behind Alex, has filed suit against Barnes & Noble, claiming that they breached a non-disclosure agreement (NDA). And they've added an interesting wrinkle: They claim to have met with Barnes & Noble throughout 2009. In hopes of drumming up work with the company, they showed them early versions of the Alex. B&N executives supposedly praised its advanced features. Barnes & Noble is declining comment.

But the case still isn't as clear cut as Spring would like it to be, at least judging from what we know so far. The Nook, designed by Ammunition, could very well have been in the works all along. Even if B&N met with Spring, they might simply have been playing their cards close--especially since the color touchscreen isn't exactly a super-original idea. (It also seems relevant that Ammunition has had a very long string of design hits; Spring seems to have sprung from relative obscurity, in 2006.)

There's also one telling difference between the two: Both have Internet access, but the Nook's touchscreen doesn't serve as a Web browser. The Alex's does.