A sort of follow up/related question to this.
I\'m trying to get a grip on a large code base that has hundreds and hundreds of classes and a large inheritance hierarchy.
Check out SourceNavigator, it's open source, works on a bunch of platforms and has a Hierarchy Browser, a Class Browser, a Cross-Reference Browser and more that will allow you navigate and understand the code.
I'm using it for some time now especially when I have new code to go through and understand.