Don't drop it, don't blow air (or cigarette smoke) into it, use a pop screen with vocalists, don't use it in highly humid conditions. Try to use a solid phantom power source with it, and a sturdy mic stand that won't tip over.

Other than that, do whatever the hell with it you can think of! ;)

Man, littledog about covered it all. I would just add that you should store it securely, perhaps in the original box with foam if that's the best you can do. I like to keep the plastic cover on with the silica gel chips little paper bag thingie in there cuz it's hyoo-mid down here in Texus! But then, some would say this is overkill. I just like to make my gear last because I am poor.
-kent