I was quite sure we stopped doing stiffed legged deadlifts because of the potential injury it can cause to the disks and spinal columns, When I viewed a number of Video's on the stiff legged deadlift ... low and behold they were saying to bend at the knees and keep the back in a straight/neutral position. I know these as kind of a bent kneed deadlift ... just not as bent as the conventional deadlift. Bent legged deadlifts may increase your strength but may hamper your deadlift technique as your ass is higher when your start the technique, you don't want that happening in a meet. The weight lifted will not be impressive. The second video mentions the romanian deadlift. This is great for increasing deadlift strength specially from the point you drop the weight to.