Instapaper – combine this with the Instachrome extension, and whenever I see a webpage I want to read later, it’ll be waiting with me as I wait for a train
Light – it’s bright! No more torches. If you lived in Hanborough, you’d need this too.
Trainline – faster than my laptop and/or a speeding bullet for checking train times in the UK
PlainText – write notes on your laptop, have them appear on your phone instantly through Dropbox and vice versa. Oh, and Dropbox of course, too.
Dictionary.com – etymologies, pronunciations, the works
Remote – control Keynote presentations from your phone.
Glympse – let other people know where you are.
Skype – I can call Mia for free while walking the streets
iTrans Tube and Tube Status for planning London Underground journeys
Snaptell – red laser black magic. Point at a book, and have elves whisper about it to you.
Angry Birds – the most popular mobile game of all time
Spotify – all the music in the world on the go. Requires a Spotify subscription
Shazam – tells you the name of songs that are currently playing