SUMMIT SUMMARY: Last Thursday's digital learning summit in D.C. brought together a bona fide crew of edtech execs from the likes of Apple, Intel, and Knewton, along with usual suspects Arne Duncan and Julius Genachowski. One major issue: e-books, which the FCC estimates can save up to $60 per student in public K-12 schools (and comes out to nearly $3 billion when you multiply by 49 million students). Another focus: high-speed network and mobile devices, initiatives that T-Mobile announced it was expanding to provide for more schools. (CEO Philip Humm highlighted current efforts underway with schools in several states.)