Checklist of 10 iPhone Apps 

1-Evernote
https://itunes.apple.com/us/app/evernote/id281796108?mt=8

2-Skype
https://itunes.apple.com/us/app/skype-for-iphone/id304878510?mt=8&ign-mpt=uo%3D2

3-Recorder Pro
https://itunes.apple.com/us/app/recorder-pro-professional/id573445641?mt=8

4-Mint
https://itunes.apple.com/app/mint-com-personal-finance/id300238550

5-Expense Tracker - Spending Free
https://itunes.apple.com/us/app/expense-tracker-spending-free/id424127169?mt=8

6-Timeless
https://itunes.apple.com/us/app/timeless-free-multiple-timers/id646386656?mt=8

Honorable mention goes to the former Pomodoro productivity app, now the Pomodoro technique.  
To learn more about this method, which times your tasks in 25 minute increments, with a 5-minute break, go to http://pomodorotechnique.com/

7-Dropbox
https://www.dropbox.com/iphoneapp

8-iDone This
https://itunes.apple.com/us/app/idonethis/id456486471?mt=8
https://idonethis.com/apps-integrations/

9-TripIt
https://itunes.apple.com/us/app/tripit-travel-organizer-free/id311035142?mt=8

10-Currency
https://itunes.apple.com/us/app/currency-made-simple/id628148586?ls=1&mt=8

Excerpted from 
10 iPhone Apps to Boost Your Online Business Productivity by Andrew P. Simon and Thomas Michaels
http://eternalspiralbooks.com/10-iphone-apps-to-boost-your-online-business-productivity/