No grudge, it just seemed as though giving an amount like that without any expectation of a return was not exactly a libertarian thing to do.

As for not knowing what your position is, that's correct but it's a safe bet that you are not a in position to match his donation.

Feel free to surprise me ;)

People have a horrible misunderstanding of libertarianism. Libertarians believe people should be absolutely free to do what they want with their money. Libertarianism is not a fancy word for narcissistic hedonism. From a philosophical standpoint, libertarians should welcome charity/philanthropy as it is a free market solution to dealing with society's problems. They are merely against forced charity (i.e. welfare, medicaid, etc.). Mr. Dietrich's donation fits perfectly within a libertarian framework. Sorry to ruin the joke, but there's no hidden juxtaposition there.

Except that libertarianism is rife with narcissistic hedonists. A subset to be sure.

And the other *isms are rife with moralizers and bottom-dwellers. A subset to be sure.

They spend a lot of time advocating public good solutions I consider unworkable due to free rider problems. I'm cynical enough to be pleasantly surprised when a libertarian demonstrates they aren't hoping to become a free rider.

That's not libertarianism. Libertarianism strongly supports private charity; it's government charity it's opposed to. Private charity is how it's supposed to work.