Amazon has announced that it has already taken over of 100,000 pre-orders for its Kindle Fire. The 7-inch, heavily customized, Android-based tablet went up for pre-order on Monday and reached that figure by the end of its first day on sale. Compared to other tablet launches, the figure is significant, although it still trails the original iPad, which took 300,000 orders on its first day on sale for pre-order.