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He's just wrong about "no adverse effect on battery life." You cannot do two things simultaneously for the power cost of just one. Sure, some tasks can be paused or shifted onto a stack and consume memory but not on-going power. But most multitaskers are talking about pausing an active application whose power consumption continues (e.g. phone, GPS, wifi, Bluetooth).
Not everyone needs multitasking but some of us really do. If you want to look at some spreadsheet data to use during a phone call you are quite SOL without it. Or to take some written notes during a phone call. or continue to track your position by GPS, maybe even getting voice directions, while doing something else.
Some uses of multitasking can be simulated with fast enough app launching, such as copying something from an e-mail and pasting into a note or contact field. But multitasking is generally smoother and avoids app start-up menus, splash screens, or other delays.
Apple has avoided it for so long with the iPhone that you should have little reason to think they'll be in a rush to do it for the iPad. Same concern about a keyboard. I'd kill for a BT keyboard for my iPhone LIKE I USED TO HAVE FOR MY PALM V frickin' years ago, grrrrr.
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