What I always hated about the iPhone was it's crappy battery status. This dumb thing shows me a meter on the upper right side and when it looks like it's down to a mere 10%t, it's nearly HALF FULL (or half empty, but that's a different story...).
The newest version of the boss.prefs fixed this. You can now have a numerical value instead of the useless bar-thingy.
boss.prefs is available via Cydia by pwning your iPhone.