Poll: Extended warranties, necessity or shakedown?

As former tech retail geeks in another life, we know better than anyone the kind of pressure salespeople at the big box retailers put on adding extended (often 3rd party) warranties on gadget purchases. Oh sure, it preys on uninformed customers' fears that their expensive new toys will break down a exactly 91 days after purchase and they'll be left in the lurch -- but sometimes those warranties can actually come in handy. That is, if you can convince the warranty people to pony up, which is just a step below the frustration of dealing with most HMOs. So, what's your take on extended warranties?