Wi-Fi requires cell data sign-up: Engadget has a Best Buy ad for the Motorola Xoom that states you can't use the built-in Wi-Fi without having at least a one-month mobile broadband subscription. Well, ain't that a kick in the pants. This is in addition to the $800 price for the feature-heavy Xoom, which comes with front and rear cameras, 1080p playback, 3G service (with a 4G LTE upgrade promise), and Adobe Flash support.
But, really: You have to activate Verizon Wireless service, even if you then cancel it, to unlock Wi-Fi? Big misstep. It's along the lines of that common scene in a car dealership when you're about to sign the papers, and the sales regretfully informs you that his manager won't sell the car without the underbody rust inhibitor treatment.
(That's from before the auto sales collapse, for you youngsters.)
Update: On 24 Feb, Verizon Wireless announced it would not require activation to use Wi-Fi on the 3G models.