Here's what's on my Android (Archos 101 G9):
AirReport (METAR and TAFs)
Aviation Flight Time Calculator
Aviation Weather
ezPDF (excellent for reading your ebooks and Jepp pdf format charts)
Flight Times UK
FlightDisplay
FlightRadar 24 FREE
intelliPilot (logbook software, free but not for long)
Met Office (awesome weather app)
NavFree (Car Sat Nav)
X-Plane
MM Tracker Free (Basic use of your Memory Map .QCT format charts)