Aside from your hand or pocket, there are two ways to carry a Motorola Droid available from the Verizon store.
One is a hard plastic snap in holster where one face of the phone is exposed and the other a horizontal leather holster.
The open face holster warns to place phone face in to prevent scratching it. Personally, I worry more about a scuffed camera lens. A scratched face is usable.
The horizontal solution lacks a belt clip that locks and unless you are fat the brunt of shock to the phone will twist it over your hip bone. It leaves no room for a waist belt lens system.
I needed a padded, secure case that is water resistant (a flap), a belt clip that won't come off when you are crawling and a vertical pull out so that the phone is grabbed securely on the longest side. This makes it less likely to get dropped.
The generic holster websites are swarming with holsters "specifically for the Droid", but many have magnetic closures. Many of these sites combine BlackBerry holsters with Droid.
A magnetic closure on a Blackberry automatically puts it to sleep, while on the Droid it puts it into a docking mode, something that is directly opposite of what you want to accomplish with a holster - prevent drain of the battery.
I found a generic case at Target today that works perfectly for the purpose. It says Golla on the case and is probably for an iPhone, but they are the same size.
As an added measure of lens protection, I sewed in the cleaning cloth you get with the screen protectors, as eventually the nylon in the case will damage the lens surface.
I was given a horizontal case (has Verizon logo on outside) for my Droid. I find it convenient and like the fact that it wakes up the phone when I remove it. Frankly, I hate the on/off/wake-up button on the Droid. I've not noticed any battery drain as a result of using this case.