On Thunderbolt
The personally most interesting new MacBook Pro feature is the Thunderbolt port, both a Display Port for monitors and a really fast successor to Firewire. Meaning, it can also be used for external storage and peripherals (once upon a time iPods sported Firewire).
My biggest Thunderbolt adoption incentive is cleaning up the cable mess behind the Mac Mini, which due to its small form factor, necessitates external drives and a mess of cables for everything else (several external drives, a printer, various iDevices, etc.). Running one cable and daisy chaining everything may not result in less cables overall, but having just one port occupied with one kind of cable would only help.
The best prior example is HDMI, which did a great job in cleaning up the entertainment system. That technology combined video and audio in one, doing away with the S video / component video / optical audio cable mess where you’d have at least several cables for each peripheral.
Apple has also locked up one year of Thunderbolt exclusivity. While this may slow down adoption by peripheral manufacturers, we’ll certainly see Apple adding Thunderbolt to as many pro Macs as possible this year, and perhaps even the iPad 2 in less than a week.
When Apple releases a Mac Mini with Thunderbolt and an SSD drive, I’m there.