For instance, on UK Xperia X10i to make the shutter sound mute, you can do:
1. allow installation of applications from unknown sources;
2. install and run UniversalAndroot.apk to root your phone (whatever it is locked to a mobile network or unlocked);
3. install and run Root_Explorer_v2.10.apk;
4. allow Root Explorer root access by SuperUser;
5. go to folder /system/media/audio/camera and ensure that folder is "rw" (read and write) and not "ro" (read only) by checking on top of Root Explorer (click on the right hand button to switch mode);
6. change sound files in sound1, sound2 and sound3 folders. It is suggested to use the no_sound.ogg file available in the sound0 folder and copying it across the other sound folders to replace the existing audio files but keeping their original name to ensure the andoid system does not crash;
7. exit Root Explorer and check that the sound is mute on the camera now;
8. uninstall Root Explorer;
9. unroot your mobile using Universal Androot (it will remove Super User application);
10. uninstall Universal Androot.
you can find UniversalAndroot.apk and Root_Explorer_v2.10.apk in the following package:
rapidshare.com/files/416177666/NoSoundPack.zip
MD5: 76BABE2867C994E4B69DB11F093230A4