- Facebook. Self explanatory.
- PhotoSynth. You can watch your panoramas take shape.
- RunKeeper. You use your iPhone's GPS abilities to track your jogging and cycling routes and can examine details of your pace and calories burned. Treadmill runs and other activities can be added manually.
- Pulse. If you follow a small number of feeds, it's a great choice.
- Dropbox. Dump files you want to sync in a folder on your computer and Dropbox will enable you to access them, download them, and view them.
- thetrainline. Journey planning, timetables, and a location-aware "next train home" option are available via a clean, streamlined interface.
- Skype. Self explanatory.
- Movies by Flixter. Choose a film and the app finds out where you're located, nearby theaters, and displays times the film is being shown. You can pin your favorite theaters to the top of the list.
- TonePad. You use a grid-based interface that enables you to turn notes on and off and create loops. Your creations can be edited, saved, and shared with others.
- Thomson Reuters News Pro. Preferences allow you to change the app's output to the UK and the toolbar provides swift access to news, pictures, videos, and stock market coverage.
- Twitter. Self explanatory.
- Comics. There are dozens of downloadable comics and once you run out of those, many more are available to buy. Reading works on an automated frame-by-frame "zoom" basis.
- Wikipanion. You have quick access to article sections, in-article search, viewing options, bookmarking, and the ability to tweet about whatever odd fact you've just discovered. There are no ads.
- Evernote. This is a service for storing notes and ideas online. You can rapidly scan your old notes and create new ones.
- Kindle. It offers a massive selection of books compared to the Apple's reading app and the experience is great.
- Around Me. This figures out where you are and lists local stuff around you. The app relies on Google Maps which means it has its flaws, but it's handy to have installed when in unfamiliar surroundings.
- Dictionary.com. A million definitions and around 90,000 synonyms are available with this offline dictionary and thesaurus. It includes a phonetic and audio pronunciation of words.
- Air Video Free. You can stream (and convert) videos from any computer running the free Air Video Server. You can only get allowance to a small number of items per playlist or folder, but careful planning can get around that limitation.
- Adobe Photoshop Express. If you're looking for the full Photoshop power, this isn't it. But if you're looking for a quick and highly usable (also free) tool to make edits to your iPhone photos, this app is ideal.
- Read It Later. You're able to save pages from the web to read them later, lacking advertisements and other junk.
- PCalc Lite. I recommend stashing the Apple calculator app somewhere and using this one. This is by far the best free calculator app for iOS with plenty of options.
- iBooks. Pretty much iTunes for books.
- Red Laser. The bar code scanner is pretty accurate. It's great for checking prices while shopping.
- eBay Mobile. The app has saved searches (which flag new finds) and allows you to create listing. It also has built-in bar code scanning.
- Tube Map. (UK app). This is a London Tube map. There are no ads. If you have a web connection the app provides live board info, a station finder, and a route calculator,
- Google Earth. Pretty much Google Maps for the iPhone. Self explanatory.
- XE Currency. You bring up a list of currencies and it shows current conversion rates.
- Shazam. Hold your iPhone near a music source and it tells you what song is playing. But Shazam doesn't always get it right.
- BBC News. The app is designed to give you quick access to breaking news, complete with playable videos and zoomable text.
- Find My iPhone. You can locate your phone within seconds. Story: My physics teacher's wife's iPhone was stolen and everyone recommended him to get this app.
- Dragon Dictation. If you get tired of typing on the iPhone this will happily convert your speech into text. You can even punctuate.
- iHandy Torch Free. This is a handy app to have installed in case you get up in the middle of the night and don't want to turn on a light.
- IM+. This gives you access to GTalk, Yahoo, MSN/Live Messenger, AIM/iChat, ICQ, MySpace, Twitter, Facebook, and Jabber.
- Virtuoso Piano Free 3. It's a perfectly serviceable mini piano. You can change the number of keys on the screen and buttons enable you to navigate the whole keyboard.
- Tuneln Radio. Tuneln Radio has a great interface for accessing over 50,000 digital stations. It also has AirPlay support and you can use it as an alarm clock. Just plug it into a pair of speakers.
- Instagram. Take a photo, put a filter on it, and upload it.
- Google Translate. Self explanatory.
- Apple Store. Self explanatory.
- Netflix. Browse, watch, and realize it's three in the morning.
- Amazon Mobile. You can browse and buy from the online store with ease.
- SoundCloud. Stores a huge rang of songs and audio clips. You can either browse or play or record and upload your sounds.