Stanislawa Tomczyk from Poland was known when poltergeist type phenomena occured around her in the years of 1908-1910.  It was later found out that she was in fact causing the activity, but only under hypnosis could she replicate the phenomena.  She was regularly hypnotized and under the state she took on another personality called "Little Stasia." She could move things without touching them, stop the movement of clocks in a case, and even pick the right numbers on a roulette by influencing it.  Dr. Ochorowicz says the physical movements of objects were performed by "rays" or fine threads emanating from her fingers.  Ochorowicz observed, "the thread gets thinner and disappears; it gives the same sensation as a spider's web. If it is cut with scissors, its continuity is immediately restored."  1910, she produced the same phenomena when tested under strict conditions at a laboratory in Warsaw.

Nina Kulagina (1926 - 1990) from Russia found her abilities by trying to develop other psyhic powers.  She is reported to have moved many nonmagnetic objects such as bread, clock pendulums, salt shaker, and many others on black and white film.  In order to create the effect, Nina had to mediate and when she was focused, she felt a sharp pain in her spine and blurred vision.  In the late 1970s, Nina had a near fatal heart attack which made her ability to demonstrate psyhokinesis limited under controlled conditions.  According to a report by Dr. Zverev, Nina's heart was irregular, had high blood sugar, suffered limb pains, dizzyness and her endocring system was disturbed most likley caused by her paranormal exertions.

Uri Geller is a popular psychic who publicly demonstrated powers of psychokinesis with his trademark spoon and key bending acts. Geller was born in Tel Aviv, Mandate of Palestine to Jewish parents with an Austro-Hungarian background, he began to bend spoons after he saw a magician on TV.  Geller stunned audiences by demonstrating he could bend metal objects far away in multiple locations on a British radio show in 1973.  Minutes after the claim, phone calls poured in with listeners saying knives, forks, spoons, nails, and keys spontaneiously bent and twisted.  Even clocks and watches that were broken began to work again.  Alot of people are still skeptical still about Uri and there have been some videos of him supposedly cheating.  
For more about Uri Geller, go to http://en.wikipedia.org/wiki/Uri_Geller