At GJ we recently moved from Blackberry to iPhone.  Our IT sister company have synced Outlook to our iPhones and so the iPhone functions just like our old Blackberrys. The iPhone has proved very popular with our team.

Here are my current top 10 business apps:

Mind mapping tool that highlights the benefits of using touchscreen technology. An excellent tool for those that like the mind mapping approach.

Quickoffice

Excel and Word functionality for the iPhone.

WorkSnug

Locate a nearby wireless network (and cafe). Uses the augumented reality approach also found on Nearest Tube.

BusinessWeek

Quality content with good small business and management channels.

National Rail

Obtain the latest train information.

Tube Exits

Shortest journey calculator for the tube. 

Weather Pro

High precision weather forecast. Very good.

Business Card Reader

Import contact information from business cards directly to your iPhone contacts.

Twittelator

Discover Twitter for yourself and join the growing business users.  Alternatively, there is the LinkedIn app.

Access the Xero accounting system on your iPhone.  Demonstrates how future business systems will integrate with mobile technology.