The Blackberry is 700mA (or .7A), I have it right in front of me.
Anyway, direct from Wikipedia:
The cellular phone carrier group, Open Mobile Terminal Platform (OMTP), have recently endorsed Micro-USB as the standard connector for data and power on mobile devices.[23] These include various types of battery chargers, allowing Micro-USB to be the single external cable link needed by some devices. As of January 30, 2009 Micro-USB has been accepted by almost all cell phone manufacturers as the standard charging port (including Apple, HTC, Motorola, Nokia, LG, Samsung, Sony Ericsson, Research In Motion) in the EU and most of the world. Worldwide conversion to the new cellphone charging standard is expected to be completed between 2010 to 2012.
In addition, on 22 October 2009 the International Telecommunication Union (ITU) announced that it had embraced micro-USB as the Universal Charger Solution its "energy-efficient one-charger-fits-all new mobile phone solution", and added: "Based on the Micro-USB interface, UCS chargers will also include a 4-star or higher efficiency rating?up to three times more energy-efficient than an unrated charger."
Here is the link, scroll down to Mini - Micro USB:
Universal Serial Bus - Wikipedia, the free encyclopedia
So as you can see, the chargers are suppose to be standard all across the board if they are using Micro USB and RIM is listed above as one of the manufactures.