You guys are on target about the importance of changing your brake fluid (I would say every 2 years). I think the term for brake fluid is hygroscopic, which means it absorbs water (another reason not to use that OLD bottle of brake fluid in your garage when servicing your brakes.
So you get the double wammy, corrosion from the inside (easily counteracted by proper maintenance) or from the outside (more subject to quality of materials and environment in which the vehicle is operated).
I'll add to Bob's list of brake bleeders by including the one by Motive products too.
. The one thing to bear in mind is that if you do it yourself, and want to do it right, read up on how to cycle the ABS while you are bleeding so that gets a full fresh dose of fluid. Dealers would use their TECH 2 scanner to handle that.