Tried white, but going back to black for the next iPhone. Black looks a lot nicer when the screen is off.
Why do you guys believe apple might release a silver one ?
I used to tend to switch on each revision, but I've stuck with white since the iPhone 4 version was released (and kept that choice when I got my 4S). I also loved my white iPhone 3GS. I think I'll switch to black when the next release happens. That all depends on which one looks better too, of course.