LG Display today announced that they have developed a 23-inch 240Hz IPS panel for PC monitors and HDTV. The IPS panel utilizes 120 Hz and scanning backlights to improve response time significantly.
http://www.flatpanelshd.com/news.php?subaction=showfull&id=1290587259
http://www.flatpanelshd.com/news.php?subaction=showfull&id=1290587259