One of my locals was having a tough time locating the Windows Phone "Mango" Training Kit .   Search for mango, and nothing is there.  So I thought I'd supply some the direct links. I also threw in a few of my other favorite "mango points of entry" as well.

Note I keep most of this stuff aggregated in the mango section of my screwturn wiki at  .

Windows Phone "mango" Training Kit - compass, gyro, motion sensor, multi-tasking, fast app switching, background agents, alerts, reminders, live tiles, search extras, calendar and contact apis - 

Sweet "mango" Samples and Source Code - camera, search extensibility, local db, xna+SL integration, ringtones, sockets, gestures, tiles, notifications, reminders, background transfer, sensor, simple motion, augmented reality 

Updated MSDN API Documentation - 

Updated XNA Documentation -