Apple has begun to accept iPad pre-orders, and details on the process are now available. For customers ordering through the online store for home delivery, the limit on iPad pre-orders is two per person, while those wishing to reserve a Wi-Fi-only iPad for pick up at an Apple retail store—no reservations are being taken for Wi-Fi + 3G models—are limited to one per customer. The ordering page notes that customers pre-ordering a Wi-Fi-only…