Just look in All Apps in the PS3 PlayStation Store or search for "TV from Sky" on PC PlayStation Store:
Remember you need Sky Go Extra for all consoles to watch Sky Go. For Half price (£2.50) for 12 months follow this link: http://www.sky.com/shop/offers/sky-go-extra/12mhp/
Thanks to realdiamond on Sky Community: http://helpforum.sky.com/t5/Sky-Go/TV-From-SKY-For-UK-PS3s-released-TODAY-Right-NOW-on-PC-and-PS3/td-p/2290975