Must Have
WPCentral
Weave
Wordament
Flixster
Wiztiles (for quick access to settings)
Pandora
Itsdagram
Amazing Weather HD
Nice to Have
Hulu+
Netflix
Fancy
Nokia Transit (awesome if you use public transit often)
Photosynth
The Daily Beast
Function Plotter
Web Apps
These are some of my favorites/most used apps. I just convinced my sister to pick up a lumia 928. It is awesome. You won't be disappointed. I switched to windows phone last November and I have to say I don't really miss anything from android.