IRobot Corp. has released two new robots: a Looj 330 gutter-cleaning robot and a Roomba 600 series robotic vacuum cleaner. The Looj improves on previous models, the Bedford company said, with a faster, more powerful auger and lower profile; Roomba 600s have optimized airflow and a better brush. The gutter cleaner is priced in North America at $299. The 600 Series start at $329.99. The company also makes military robots.