People don't think there's any strategy to Rock, Paper, Scissors, but the website of the World RPS Society delves into some of the common psychological and physical strategies used by players in the know. They also name the eight most popular gambits:
Fistfull o’ Dollars (RPP)
Paper Dolls (PSS)
Scissor Sandwich (PSP)
It's hard to whether these people in full honesty believe RPS is more than a game of chance, but I defy anyone to beat my lifetime winning percentage of 56%.