is now available for download & install, check your itunes right now!
explanation of the update says,
this update contains bug fixes and improvements, including the following;
Improves the formula to determine how many bars of signal strength to display 🙂
so you can see the difference between the iOS 4.0 (on the left) and 4.0.1 (on the right) if you take a close look at the bars on the images below.
the first battery bar in the updated version is a little higher than the previous one, so from now on we will feel much better, clever idea by Apple..