Judging by the initial round of reviews for the iPad, it looks like the Kindle could be the first casualty of the Apple tablet's arrival. The iPad is getting high marks as an e-reader, making its threat to the Amazon device seem less abstract than it's been up to now. Since the Kindle has been the yardstick for evaluating other e-readers to date, reviewers often mentioned how the iPad stacks up against it in that regard.