Barnes and Noble officially announced their e-reader, the "Nook". It's got two displays - a 6" E Ink (16-level gray) and a 3.5" touch LCD. The Nook runs on Google's Android platform, has 2GB of memory built in and a microSD card slot, and can play MP3 files, photos and more. It supports ePub, PDFs and more formats. There's free wireless in the US (via AT&T) and Wi-Fi, too.
The Nook is available from Barnes & Noble's site, for 259$. It will ship in November.