The killer application for the iPhone is expected to be location-based services, made possible through its integrated GPS unit and high-speed internet connection.
The ability to know where someone is and provide them with local information, alerts and other services has triggered a race between a handful of start-ups hoping to get a jump on a market which is likely to be jammed with established social networking and instant-messaging players.
Remember the milk
A popular task management and reminder service. Founded by Australians Emily Boyd and Omar Kilani, the application was originally designed for the web.
iCharge for iPhone
Another Australian invention, this allows users to take credit card payments on the road without additional equipment. The service is currently confined to Australian merchants and the company is seeking international partners.
Google Docs Mobile
Allows users to view documents, spreadsheets and presentations.
A free web application that helps freelance or project workers keep track of client billing.
A mobile social networking tool that makes use of the iPhone's GPS unit. The application lets you share your location with a group of friends and tell them what you are doing.
Mobile version of popular web-based office suite allows users to create documents, spreadsheets and presentations on their handsets.
SpeechCloud Voice Dialer
A free programme that allows voice dialling - useful when driving.
A free Apple programme that turns the iPhone into a remote control for iTunes or Apple TV over a local wireless network.
Mobile version of popular social networking applications.
Tracks eBay bids and sale items.
Foad Fadaghi is the technology editor for BRW magazine, a division of Fairfax Business Media.
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