Sony in Japan today started the official service of the PlayStation Now for PC. Using this service you can play more than 200 PS3 games on your PC using a DUALSHOCK controller, your PSN account.
The service costs 2315 Yen + tax / month and 5463 Yen + tax / 3 month. According to Sony you need minimum 2GB or more RAM, Core i3 or AMD A10, Windows 7, 8, 8.1 and 10 and minimum 5 Mbps or faster internet connection is strongly suggested.
You can download the application from here: http://www.jp.playstation.com/psnow/pc-app/
And you can find the currently available games list in here: http://www.jp.playstation.com/psnow/list.html