Galaxy S on 2.2 supports taking screenshots by holding the back button and tapping the home button simultaneously. However I find my phone occasionally doing it when I only tap the back or only the home button (which I do a lot).
This is inconvenient, but I don't mind too much it taking screenshots, but the bigger problem problem for me is the fact it makes a camera sound. This makes it sound like you just took a picture, and in public spaces it can land you in some embarassing situation. People might think you're a stalker, creep, or in some situation I think you can accidentally got into a fight or problem with police (I haven't landed in any of these situations, luckily). But it's quite dangerous.
Does anyone have the same problem? How to stop this or at least turn off the sound (other than putting my phone on silent mode)