just wanted to add another thanks to this thread.
worth noting, as I've seen elsewhere across the internet, the water pump can be removed and reinstalled without pulling the motor mount and dropping the engine. It is tricky, and it only goes one way, but it can be done. I did it yesterday. Didn't have a torque wrench handy so didn't want to loosen the motor mount -- just took the 4 bolts out of the AC Compressor and hung it aside out of the way with a wire coathanger.
As has been mentioned, the trick to getting it out starts with flipping it 180 degrees so the impeller is pointing away from the engine block. Then you just have to rotate and twist it just right. It felt like one of those "magic trick" games where you try to free the ball from the cage and it will only come out one way... I can't really explain exactly how it's done, just be patient and keep trying. and then reverse it to get the new one in.
also, thanks to this thread I decided to go ahead and replace the overflow reservoir bottle - I had noticed that I was losing coolant, but pretty slowly... couldn't find any leaks around any hoses or around the thermostat housing, no cracks in the radiator, etc. After I took the old bottle out (which was yellow and really nasty looking down in there), I could see a couple of those hairline cracks on the very bottom of it.