Screen capture is built-into ICS and Jelly Bean.
"Saving DROID Razr's, one battery at a time. :-)" - (credit SallyC)
Avatar is Maxwell Smart, AKA Agent 86, from "Get Smart" (with his signature "Shoe Phone"), a SitCom TV series by Mel Brooks & Buck Henry, based on the spy thriller series, "The Man From U.N.C.L.E.".
"Guidelines of Conduct" for DroidForums.net
Current lineup: Galaxy Note 2, Galaxy Note 8.0, MotoActv
Previous smartphones: Galaxy S3, One X, Droid RAZR MAXX, Galaxy Nexus, Rezound, Galaxy Note, iPhone 4S, Droid Bionic, Stratosphere, Droid Charge, Vitality, Droid Incredible 2, Thunderbolt, Palm Pixi Plus, Droid 3, Fascinate, Droid Incredible, Droid Pro, Droid 2 Global, Droid X, Droid, Treo Pro, Touch Pro 2, Touch Pro, Q9m, XV6800, XV6900
Previous tablets: Transformer TF300, Evo View, Transformer Prime, Transformer TF101, Thrive, gTablet
The easiest way on the S3 is to do a palm swipe across the screen " pretty much touching it while you swipe your hand across the screen" to do a screenshot.
S3 Running "Buttery Smooth" CM 10.1 Official/JB 4.2.2 ROM /S4 Stock 4.2.2 JB, Device is Currently on Verizon Lockdown