The iPhone app store is great, but some of the apps are poorly designed. One such design flaw can be seen in certain games that have music, but no volume control. This can often be fixed with the physical volume control on the iPhone, but what if you have an iPod touch, and the in-game music is too loud for your tastes?
It turns out that the new volume limit feature is a global setting, not just applicable to iPod music playback Go to Settings » Music » Volume Limit from the home screen, and set it to an agreeable level. This will automatically lower the volume of those pesky games.
You have to set it back when you're done, if you want to have your iPod music louder, of course.
Mac OS X Hints
http://hints.macworld.com/article.php?story=20080723204215600