From what I read in the sites I sent links for, artificial gravity has been theoretically possible for a long time. Experiments have been implemented studying spin-induced artificial gravity. But, due to the forces invoked by this method, a conflict between what the eye sees and the inner ear senses results in motion sickness unless the spin is kept low. To keep low spin and maintain a 1 g environment, it looks like you need a big radius. (Ie: you need a heck of a big ship or station!) Another factor is the one concerning "weight" gain and loss as you walk away or toward the spin axis. In an environment such as a spacestation, this loss or gain difference would be able to be felt by moving a matter of inches; that would be extremely uncomfortable, I would think....

At least that's what I got from the articles I read. Have fun wading through them... (and ignore the physics; it's just the mathematical substantiation.)