Brake Piston Cube Tool
I've been a semi-casual DIY'er for the past 30 years. Just recently, some cars I've owned have rear brake calipers that you need to rotate the pistons while compressing when replacing pads. Rather than buying a $40+ toolset I just came across this thing called a Brake Piston Cube that you can get for less than $10 shipped to your door from Buy.com. It fits on a ratchet extension and on its six sides are different pin configurations to match up with different calipers/pistons.
Thought I'd share.