As a RAZR -> Touch Pro -> Touch Pro 2 user, I've amassed a number of MiniUSB charging devices and cables over the years, which simply worked with most of my devices.
Starting with my wife's LG Lotus, I've started noticing more MicroUSB devices trickling into the house. Rather than throw away all those accessories I've already invested in, i found these cool little mini-to-micro USB adaptors on Meritline:
http://www.meritline.com/mini-usb-mi...--p-47016.aspx
These ones are nice because they have a sturdy little tether on them, so I can charge either type of device, and not lose the adaptor. I keep one on all of my mini USB cables!