Favourite iPhone apps at my office

So many people have iPhones at my office that I've done a brief survey of the favourites.

• VoucherCloud - informs you of vouchers and freebies.
• Shazam - identifies music tracks that you are listening to. Just point your iPhone at the music source and Shazam will identify it for you.
• TweetDeck - keep up to date with Twitter. There is also EchoFon which is great too.
• Dropbox - transfer and share files between your computers and with friends.
• Tiger Woods PGA Tour - by EA. Loved by those who are missing the fairways and need to chill out while practising their swing.
• Ambiance - mix your own ambient tracks to help you chill, go to sleep. May be handy for soothing the baby.
• Things - this is a task manager. A couple of the sales reps use it to help them be where they need to be on time.
• London Tube - handy for any overseas visitors who need to get around London.

I've been trying to use the search engine on the Apple site to find links to the apps but I'm not impressed. The searches are not very well ordered and key words that you would expect to work, like iPhone and golf, just don't return any decent results. 

What are your favourites?