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Scoble talks about LongHorn - this part made me sit up and take notice:

For another, it's the largest software project I've ever heard of. Thousands of people working on it. Tens of millions of lines of code. Heck, it takes a bank of computers several hours to compile it (and the code size will probably grow quite a bit between now and release).

Any project of that scale is problematic to my mind. For one thing, if it takes that long to compile agility is right out the window. For another, anything that big has too many people involved in it - realistic collaboration is simply impossible. Makes me wonder just how much completely unknown duplication is taking place, for instance. I'm sure LongHorn will ship (in one form or another). I'm also sure that the end results won't be entirely predictable.