Farm Contractor is an iPhone app that helps agricultural contractors record client and job details and email them back to the home or office to be invoiced
Farm Manager is an app that helps farmers record cropping , livestock and machinery procedures and and access this information with ease.
Check these apps out on the iTunes app store: http://itunes.apple.com/us/app/farm-con ... 27397?mt=8

Does somebody use such or similar apps? How is it?

Hi Deineko Inna
Friend of mine is using Farm Manager, this app allows farmers to record there farming information and access it at any time , he has been using this app for few months now and it is very handy to have all your information on you when you are out in the field . These apps have been out for 12 months and are being used by 2000 farmers from around the world.
You can check these apps out at www.stringybarksoftware.com or on the apple app store:

http://itunes.apple.com/au/app/farm-man ... 35168?mt=8
http://itunes.apple.com/au/app/farm-con ... 27397?mt=8

Ben, thank you
Here are few other apps for iPhone:

Top 10 Android apps for Farmers (iPhone too)
http://dinogiacomazzi.com/2010/06/top-1 ... phone-too/