My R56 needed a new clutch at less than 18 months old (and around 12k miles).
Dealer initially warned that I would be liable for the cost of repair, as the clutch isn't covered under warranty. Apparently the default line is, "well - it's probably your fault!" with some spiel about not being able to drive properly.
That said, they immediately approached BMW who, with relatively little fuss, agreed to cover all costs. The clutch was effectively written off as defective, as even if it has been abused, or the car driven by a new driver, it should not fail so prematurely.
I put it down to a one off, and didn't think too much about it... perhaps it was one bad clutch out of however many other thousand? That said, it will be interesting to see how many people on here have similar tales - seems we're at 3 already!
Long story short, I got it sorted, nice and easily, although it was well within warranty (even though not a warranty claim) and with below average miles for its fairly tender age. Would be a totally different story (I imagine) if the car was 3 years old with, say, 40k on... I saw the bill for the work which BMW covered and I certainly wouldn't like to be hit with that personally!