That's strange. All my devices (e-book reader, card reader, external HDD etc.) have same connectors. Exceptions are camera (and my mp3 player, but that doesn't even have a microUSB, it's a specific iRiver connector) and some of my Wi-Fi toys (USB access point, ADSL modem).
Quite a few of those bastards... which ones do you have?
Starting from the left, 3rd is the most widespread one, hence the best The last one is what my Wi-Fi toys have and the second one is what the camera has.
The reason that digital cameras often have a unique connector is that recent cameras have tended to integrate their video out connections into the USB connector in order to save space. Of course that requires a connector with more pins.
But I agree with you 100%, a "standard" that keeps changing isn't really a standard at all.