These are all great ideas. I have a 720 gal tank and together with the stand it's about 7 1/2 ft tall and water changes are a pain to say the least.
Right now I'm just using long vinyl tubing (1" inside dia) siphoning to a drain or out the window. It does the job, not super fast or anything but it drains pretty decent. I am thinking about adding a pump to the draining portion but wondering if it's worth the effort.....probably is when I'm pulling 250 gallons out at a time.
To refill I have a flow diverter valve off the shower head in my guest bathroom. Looks like a "Y" with a little valve handle on it. When I want to use it to fill up the tank I hook up a garden hose (got an adaper->pipe thread to garden hose thread) to the diverter and run the shower (usally the bath faucet actually) til I get the temp I want and then turn the valve handle thus diverting the water from the shower head to the garden hose going to my tank. Once again, certainly not the fastest but it does the job.
Lots of good info here so far, keep it coming!