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With 2x Thunderbolt you will be able to hook up multiple external Displays, thats great news for me ;)

Could possibly undermine Mac Pros in the future.

I think it's clear from Jobs' philosophy as the PC as the truck that he wants to make the iMac the new Mac Pro. Thunderbolt's the first step in making it possible to add the customization options of the Mac Pro to the iMac as a peripheral.

Pure speculation, of course, but I think the trend is starting to show.

I would agree with this, and have seen it as a trend. Of course, the purpose of the Mac Pro was always a specialized machine, but the iMac is definitely starting to compete in power and options, and probably the better choice for most people who want an Apple desktop.

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