Screens Shots in ICS 4.0.3
There have been a few posts on how to take a screen shot using the Gingerbread version of Android on the SG2. However when the phone is upgraded to ICS 4.0.3 (T-Mobile in the UK) the key combination changes. It on ICS press the volume down and power butons at the same time. Took me a few attempts to get the knack as I kept turning the volume down rather than take a screen shot. However, once I got the hang of it I can do it every time.