I recently bought a Kindle DX from ebay, for very cheap. The seller didn't seem to know what generation Kindle it was, because they said it was either a first or second generation. The picture included leads me to believe it was a DX, however, but I wanted another person's opinion, just to be sure. I know I'll find out when it arrives, but that won't be for several days yet, and I was feeling impatient.
The picture I've included in the post, is the picture that the seller included with the listing.