If you’ve tried doing any iPhone development with Virtual Earth you’ve probably been swearing up a storm, beating down your computer, and lost hours of sleep wondering how Loopt, Weather Central and now NMobile got their iPhone apps working. Well, it would be treacherous but:

Consonance Software has created the VirtualEarthKit for ObjC / Cocoa developers. The VirtualEarthKit contains a set of APIs that you can reference for your iPhone projects to develop iPhone applications using Microsoft Virtual Earth. So, download the VirtualEarthKit (in SVN Repository | trunk | English.lproj | InfoPlist.strings), add a reference to the library from your project, then access the VirtualEarthKit APIs which automatically wrap the Virtual Earth Web Service requests and parse the responses for your application. The VirtualEarthKit supports many of the VEWS features, in addition to getting maps, including geocoding, reverse geocoding, adding pushpins and user profile elements (device type and distance unit enumerations).

Full Article