With ICS you no longer need a third-party app to take a screenshot simply hold down ... Power
until it is taken. There will be a loud click.
To remove the loud click ...
- You must allow installation or non-market apps ... System settings | Security & Screen Lock | Unknown source ... select Allow installation of non-Market apps
- Download Enforced Stream Silencer (attached below)
- Run Enforced Stream Silencer
- Check the option Disable STREAM_SYSTEM_ENFORCED
I installed it and it seems to work. Root-ing is not required. I do not know who wrote the app.
There are no guarantees ... use it at your own risk. If you are not comforatable with any part of this installation ... I recommend that you don't do it.