I don't know, I don't really -get- minecraft. Toady's spent years making this great game from the bottom up, and some guy takes a bit of open source code, enhances it moderately to make it more dwarf-fortress esque, charges for it, makes millions, and toady is still...well, toady, ordinary guy. (though possible dwarf in disguise).
I mean, I tried out minecraft, but I just got so bored. I just don't understand the point of it. There's no depth to the world and not really all that much to build, at least compared to what I'm used to. I really just don't understand it. And I feel so bad for toady, because I feel that a number of the features are clear knock-offs/nods to DF.
I can see how they'd have different points though; DF basically is trying to be a fantasy world simulator, while minecraft, at heart, is trying to let people make pretty things. And people do make pretty things in DF, but its so much more. But having all that 'much more' sacrifices the graphics.
So I'm ambivalent. I'm happy for the minecraft players, happy they are happy, but I love DF more. The only thing that makes me sad is for toady, because I really feel the quality of DF in terms of the code and the work done into it exceeds minecraft, but toady isn't a millionare, while minecraft's maker has made 3.5 million off of it as of this month.