Despite it being a resurrected thread, I will throw a few in anyway
weatherpro knocks the socks off metoffice or any other weather app I have tried, worth paying the annual subscription, its only a few quid.
Peaks identifies the hills and mountains you point the phone at, pretty cool for outdoorsy types. http://peaks.augmented-outdoors.com/
nightsky does a similar kind of thing for star constellations. http://itunes.apple.com/gb/app/the-night-sky/id475772902?mt=8
I can buy tickets through a Deutsch bahn app on my phone and if requested by an inspector show the ticket on the phone.
Online banking app from my bank, includes navigation to nearest cash machine.
TomTom for navigation
Then lots of standard stuff, IMDB, wikipedia, facebook etc.