Has anyone come across this mobile app before?http://osticketapp.com/
Yes. The authors posted here on the forums about it. Last I checked it requires modding the core files to work (in this case replacing some files).
I paid for the app and it's a not so great. Font and sizes are made for iPhone 4 probably. Authors do _not_ reply, and it doesn't work fully on the push notification. :/ 2/5 jalapenos.