Here are some of my favorite Bitcoin apps for iOS:
As I mentioned in How to put fake 'widgets' on your iOS home screen one of my favorite Bitcoin apps for iOS is Bitcoin Live ($4.99, App Store) which allows you to see the price of Bitcoin on your iPhone home screen without ever opening the app, courtesy of the badge app icon. The price updates every 60 seconds and it's the only app the does this. It's a little spendy at $5 and I've asked the developer to add push notifications for BTC prices and more exchanges (like @coinbase), so we'll see what happens. Bitcoin live is a home page app for me.
ZeroBlock (free, App Store) is also one of my favorite Bitcoin apps because it allows you to monitor the current Bitcoin exchange rates and features a gloriously simple black and white UI (pictured) and unique, four-way swipe gestures. It also provides push notifications on high and low Bitcoin prices. ZeroBlock also combines Bitcoin market exchange data with an aggregated news feed to give you easy access to what's happening in the Bitcoin market.
BTCmon Bitcoin Monitor ($0.99, App Store) makes it onto my list because in addition to the features you'd expect from a BTC app (Bitcoin exchange rates and Bitcoin Network stats) BTCmon also allows you to monitor multiple miner stats for several popular Bitcoin mining pools including BTC Guild, Mt. Red and Slush.
Coinbits (free, $4 ad-free, App Store) features live Bitcoin price updates from more than 80 markets in all available currencies and alerts for every market if it crosses a pre-defined threshold. Coinbits also supports other crypto-currencies including Litecoin, Primecoin, Novacoin and Namecoin.
MobileMiner (free, App Store). Nothing is more stressful than wondering if your rig is offline, costing you money. If you're a Bitcoin or Litecoin miner (and you should be!) you can use this indispensable tool to monitor your rig. MobileMiner allows you to remotely monitor and control your Bitcoin, Litecoin, and other Cryptocoin mining rigs and it's compatible with my favorite mining app for OS X, Asteroid. Setup is simple and there are no firewall changes or port-forwarding required.
Are you a Bitcoin/Litecoin investor, speculator or miner? What are your favorite BTC/LTC apps?