The charger port on the Droid is definitely a MicroUSB. I went to my local computer supply shop and picked up a MicroUSB-USB cord so I could use my cigarette plug charger on it. Love those stores, I pity anyone who buys HDMI and other data cables from Best Buy or other "big box" stores.
As for a belt clip, a company called Seidio makes some. They' sponsor this forum as well, I think. Here's a link to one on
Amazon. I've heard good things about all that Seidio makes, but I have never used one of their products.