We've seen the Kindle DX fail as a textbook alternative, but the iPad marches ever onward as a pioneer of wireless education. Or so it seems, anyway. This time the tablet has set its sights on a private school in Knoxville, TN, where all students from fourth to 12th grade will be required to carry iPads starting this August. Webb School students can either provide their own slate or lease a WiFi-only model for $20 a month. Just like administrators at Seton Hill University, the folks at Webb School see the iPad as an eventual re
