Hi Shawn, I do disagree a little.
Not all of us are from the C/C++ world. I personally use Delphi.net, and I personally think OO inheritance is a great option/tool.
Just because some people love operator overloading doesn’t mean you should remove the ability to inherit from that base class. Personally we can extend a class (yes I use different names for my new classes, but I know what you are talking about) to provide more then just the base class offerings.
There are plenty of times I’ve wanted to extend from a class in .NET and been denied the means, because it’s sealed. Personally I think sealed has its place, but it seems a little overused currently on some classes in the framework. 