We were wondering how Kindle's impending active content (read: apps) would be harnessing that free Whispernet bandwidth. As it turns out, there's just a smidgen allowed for gratis. According to the terms laid out by Amazon, there's a 70 / 30 revenue split, with that smaller percentage going to Bezos and co. "net of delivery fees of $0.15 / MB." The price tiers is a little simpler: apps can be free if their download over 3G is less than 1MB and they use less than 100KB per month, per user. Apps between 1MB and 10MB require a one-time purchase fee that offsets the bandwidth usage, and likewise a subscription fee is needed for those that plan on allowing over 100KB of a monthly data streaming. (To put that in perspective, this post -- just the copy -- is 4KB. That image above is 120KB.) Anything over 10MB requires a download over WiFi, and the maximum file size is 100MB... and if anyone manages to justify a 100MB app that runs on a greyscale E Ink display, color us impressed.