Samsung Galaxy Player 4.0
I picked one up recently, and makes for a surprisingly decent LED reader. The display is quite crisp, and easy to read in most forms of light short of direct sunlight. I considered getting the five-inch model, but it's something of a beast.
It's basically the Android equivalent of the iPod Touch - a Samsung Android phone with the phone bit removed. I've wanted a handheld Android device that wasn't a smartphone for quite some time now, so I'm pleased - the ebook reader is almost a bonus at this point.