There was also the Micro-A which I found on some dev boards. I think the Arduino Due (Arm Cortex M3 chip) used one for the USB host port as well as an Atmel Arm uc board.

Also that weird, really small USB connector that was found on some early digital cameras. I think Kodak was a big user of it. Sorta looked like a narrower and taller version of the Mini-B. Maybe the Mini-AB but that doesn't look like it. I have one in my box at home.

Since school started this year, I bought both my kids TI-84 plus CE calculators. Both were being sold cheap because “no charging cable” (uses a mini-B) while I had a dozen in a box.

I wish that happened a lot less as I have entirely too many old cables.

I hold on to my precious few mini-Bs. They also seem to have a tendency to break.