Originally Posted by n_maher
Micro USB is the new "standard" established by the USB-IF on January 4, 2007. Nokia, Samsung, Motorola, Sony Ericsson and LG (among others) have all adopted this connector moving forward.
I'm 99% certain the micro connector is shown on the far left in this image.
]pictured: micro USB, mini USB, B-type, female A-type, A-type
It's not the same as the one on the far left. That's the older type Micro USB. The newer Micro USB Type B is the same width as Mini USB, but a little thinner. The giveaway are two little "locking tabs" on the bottom flat side for the newer Micro USB Type B.
I have some older devices that use (some digicams and a bluetooth headset). The newer Micro USB Type B is pretty stupid because it's not really that much smaller than the old Mini USB. But it's been adopted as a standard charging connector for phones internationally, so get used to it. At least until they make something else "standard".
Newer Micro USB B (smaller connector on the right, shown with flat side up, notice the two locking tabs)
To make things even more confusing, here's the oddball Micro USB Type A.