Terrific CodeChat - great follow-up after the 3 day Jump Start from last week. For anyone that didn't attend, check out the recording that should show up on MVA in the next week or so. Best Jump Start I've attended so far. Thanks too, for the pointer to the OneNote API in this session.
Haven't had a chance to follow all the links above, so at the risk of being redundant...
You might also want to check out the "Building Apps for Windows Phone 8.1 Jump Start" over at Microsoft Virtual Academy. MVA WP8.1 Jump Start
It's a two and a half day "Live" presentation by Andy Wigley and Matthias Shapiro. If today's session was any indication - day two and a half will be super. The sessions are being recorded. If you missed today, you can always pick up the stream once it's available.