It would add few cents to manufacturing cost, but it would be much handier and people wouldn't have to buy a different cable to connect their phone to their computers.
Hmm, maybe someone has already patented this idea, and others aren't just willing to pay for using it. If it ain't patented it's mine, my idea and send in the royalties to... just kidding, it should be industry standard and free to use.
Just add that USB port to the side of the charger! Please.
USB Mini plug in the picture, just because my camera, mp3 player and phone use it and I haven't got any micro-USB cables.