We have already developed and app using MonoTouch and it's available in the AppStore. We are looking for someone to develop the Android version ASAP!! The system uses WebService 2.0 calls for all data and also uses SQLite3 to store information locally too.
We are looking for and EXPERIENCED developer in MonoDroid that can help to move this over the next 2 months or so.
Feel free to contact me and I will get back to you so we can get this going. You can look at the website at : www.mygeotrex.com, or download the app on any iOS device.