The pricy Sony 13" Digital Reader (plastic e-ink display) has a web browser, so it can be used to display some web pages and function as a pseudo-monitor. It weighs 358 grams / 0.79 lbs. Android clones are expected later this year, when Sony's exclusivity period on the new lightweight e-ink screen expires.

http://goodereader.com/blog/electronic-readers/sony-digital-...